If you can't get to a command prompt in safe mode, then the infection is probably complicated by severe file corruption in windows, we can only guess what went wrong.
If you know someone with a generic real window's xp home oem disk you could run it as a repair disk, fix enough of the boot and system files to attempt a malware removal
This is just one example of waiting to apply powerful tools like sdfix until preliminary cleaning is done
A clean install is usually the best solution
I have had a few computers that wouldn't even boot as far as yours and the best I could ever figure after running a repair disk was just system file corruption from software and minor spyware/adware
Running a repair disk did not fix all the problems and we ended up doing a clean install
Edited by DaChew, 10 June 2008 - 05:59 AM.