Jimmy:

Estoy segura que con la gran cantidad de estupideces que te envie en el último Mensaje constataste que no se "NADA" de computación.

En todo caso, ahora segui tus instrucciones y apliqué Diks Cleaner. El informe que arrojó es el siguiente:
"System Temporary Files (64 kB; 1 item): cleaned 64 kB in 1 item.
Temporary Internet Files (817 kB; 136 items): cleaned 273 bytes in 2 items.
Internet Cookies (1 kB; 13 items): cleaned 1 kB in 13 items.
Internet History (0 bytes; 95 items): cleaned 0 bytes in 84 items.
Recent Documents (17 kB; 21 items): cleaned 17 kB in 21 items.
Run... List (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Find Document List (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Find Computer List (0 bytes; 0 items): cleaned 0 bytes in 0 items.
URLs in IE Address Bar (299 bytes; 12 items): cleaned 299 bytes in 12 items.
URLs in Shell Address Bar (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Media Player Recent URLs (127 bytes; 1 item): cleaned 127 bytes in 1 item.
WinZip Recent Files (0 bytes; 0 items): cleaned 0 bytes in 0 items.
WinZip Extract To Folders (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Paint Recent Files (0 bytes; 0 items): cleaned 0 bytes in 0 items.
WordPad Recent Files (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Opera Cookies (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Opera History (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Opera Cache (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Opera Visited Links (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Opera Downloaded Files (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Recycle Bin (0 bytes; 0 items): cleaned 0 bytes in 0 items.
7-Zip History (0 bytes; 0 items): cleaned 0 bytes in 0 items.
CutePDF Writer (0 bytes; 0 items): cleaned 0 bytes in 0 items.
WinImp History (0 bytes; 0 items): cleaned 0 bytes in 0 items.
ACDSee (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Acrobat Reader 4/5.x/6 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Lavasoft Ad-Aware (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Adobe PageMill 2.0 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Agent NewsReader (0 bytes; 0 items): cleaned 0 bytes in 0 items.
JASC Animation Shop 3.0 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
AX-Icons 4.x (0 bytes; 0 items): cleaned 0 bytes in 0 items.
BearShare (0 bytes; 0 items): cleaned 0 bytes in 0 items.
CoffeeCup GIF Animator (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Check Disk File Fragments (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Common Dialog MRUs (1 kB; 14 items): cleaned 1 kB in 14 items.
Copernic 2001 Basic/Plus/Pro (0 bytes; 0 items): cleaned 0 bytes in 0 items.
CuteFTP 4.0 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
CuteHTML (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Divx Player (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Drive Image 6 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
EditPad (0 bytes; 0 items): cleaned 0 bytes in 0 items.
EditPlus2 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Flash 5 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Flash Get (0 bytes; 0 items): cleaned 0 bytes in 0 items.
FotoCanvas Lite (0 bytes; 0 items): cleaned 0 bytes in 0 items.
FreshDownload (0 bytes; 0 items): cleaned 0 bytes in 0 items.
GoldWave History (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Google Tool Bar (0 bytes; 0 items): cleaned 0 bytes in 0 items.
ICQ2000A/B (0 bytes; 0 items): cleaned 0 bytes in 0 items.
IE Autocomplete Form History (4 bytes; 1 item): cleaned 4 bytes in 1 item.
Inno Setup (0 bytes; 0 items): cleaned 0 bytes in 0 items.
IZArc History (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Macromedia Dreamweaver 4.0 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Map Network Drive MRU (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Mass Download (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Media Player Classic (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Metapad (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Microangelo (0 bytes; 0 items): cleaned 0 bytes in 0 items.
MS Imaging (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Microsoft Photo Editor (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Microsoft Publisher (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Microsoft Works 4.5/2000/6/7 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Nero Reg. & Cache (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Netants (0 bytes; 0 items): cleaned 0 bytes in 0 items.
NetCaptor (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Office 95/97/2000/XP/2003 Recent Files (4 kB; 4 items): cleaned 4 kB in 4 items.
OpenOffice mru (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Paint Shop Pro 7/8/9 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
PowerArchiver (0 bytes; 0 items): cleaned 0 bytes in 0 items.
PowerDVD (0 bytes; 0 items): cleaned 0 bytes in 0 items.
PowerZip 6.0 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Quicktime Player (0 bytes; 0 items): cleaned 0 bytes in 0 items.
RealOne (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Realplayer 8.0 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Regedit Recent Key (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Search History For Windows 2000/XP (0 bytes; 0 items): cleaned 0 bytes in 0 items.
SmartDraw 6 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Sonique (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Swiff Player (0 bytes; 0 items): cleaned 0 bytes in 0 items.
SWiSH 2.0 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
The Playa (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Ulead GIF Animator (0 bytes; 0 items): cleaned 0 bytes in 0 items.
WebFerret (0 bytes; 0 items): cleaned 0 bytes in 0 items.
WinAce (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Windows Memory Dump (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Windows Log Files (62 kB; 20 items): cleaned 33 kB in 11 items.
WinRar 2.x (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Forced \Windows\Temp cleaner (256 bytes; 5 items): cleaned 256 bytes in 4 items.
WordPerfect 7/8/9/10/11 (0 bytes; 0 items): cleaned 0 bytes in 0 items.
WinXP prefetch clean (1726 kB; 34 items): cleaned 1726 kB in 34 items.
Yahoo! Messenger (0 bytes; 0 items): cleaned 0 bytes in 0 items.
Zone Alarm Log File (0 bytes; 0 items): cleaned 0 bytes in 0 items.

Scheduled 10 file(s) for removal on reboot.

Cleaned total of 1850 kB in 202 items."

Terminado este proceso, aprete "exit" y parece que quedó todo bien.

Ahora, tratandose del informe de Bitdefender, tenías razón, incurri en un error, pero ahora si lo hice bien y esto es la información que arrojó:
// Fichero de Informe de BitDefender
//
// Creado el: 15/09/2005 11:50:23
//
//-----------------------------------------------------------------


Estadísticas

Ruta de análisis: A:\
C:\
D:\
E:\
Carpetas : 2322
Ficheros : 352653
Archivos : 3371
Ficheros empaquetados : 54094
Virus encontrados : 0
Ficheros infectados : 0
Advertencias : 0
Ficheros sospechosos : 0
Ficheros desinfectados : 0
Ficheros eliminados : 0
Ficheros copiados : 0
Ficheros trasladados : 0
Ficheros renombrados : 0
Errores I/O : 26
Tiempo del análisis :01:22:08
Velocidad del análisis (ficheros/segundo) :71

Firmas de virus : 206426
Plugins de análisis : 13
Plugins de archivo : 39
Desempaquetar plugins : 4
Plugins de correo : 6
Plugins de sistema : 1

Opciones de análisis

Detección
[X] Analizar los sectores de arranque
[X] Analizar archivos
[X] Analizar ficheros empaquetados
[X] Analizar e-mail

Tipos de ficheros
[ ] Programas
[X] Todos los ficheros
[ ] Extensiones definidas:
[ ] Excluir extensiones: ;

Acción

Elementos infectados
[ ] Omitir
[X] Desinfectar
[ ] Eliminar
[ ] Copiar en cuarentena
[ ] Mover a cuarentena
[ ] Renombrar
[ ] Preguntar al usuario

Segunda acción
[ ] Omitir
[ ] Eliminar
[ ] Copiar en cuarentena
[X] Mover a cuarentena
[ ] Renombrar
[ ] Preguntar al usuario

Opciones de análisis
[X] Activar advertencias
[X] Análisis heurístico para virus desconocidos
[ ] Mostrar todos los ficheros en log
[X] Fichero de informe: vscan.log
[ ] Añadir al informe existente
Ficheros analizados

La pregunta te la formulo, porque el antivirus no me ofrece ninguna opción de eliminar o corregir los errores, entonces, no se que hacer. Además, no se si esos errores pueden afectar gravemente a mi PC.

Así las cosas, podrás ver que he realizado todo según lo por tí ordenado, pero lamentablemente los problemas con mi PC continúan, ahora, cuando enciendo el PC aparece el siguiente mensaje tras abrir el XP:

"Se ha producido la excepción Unknown Software exception (0x0000096) en la dirección 0x00613990."
despues me dice que apriete finalizar para depurar y lo hago, pero cuando lo prendo de nuevo, vuelve a aparecer el mensaje!!!!!
Espero que puedas ayudarme tambien esta vez de la forma en que lo haz hecho hasta ahora. Si no, te agradezco tooooooodo lo que me has ayudado.

Cariños desde esta asoleada región.

Germana