hey gerbil,
thx for ur reply but my problem is I am not able to copy the files in repair folder to the config folder thru' recovery console. It always says "the files could not be copied"..... what...

1. cd system32
2. cd config
3. ren system system.old
4. cd .. (note the space after cd it is important)
5. cd .. (note the space after cd it is important)
6. cd repair
7. copy...

Thru' the recovery console, I checked that "c:\windows\system32\config\system" file has been renamed automatically to c:\windows\system32\config\systum and also other files like security etc are...