registry changes seems to have broken windows

A friend of mine recently got his computer infected with a virus (a trojan). In order to completly get rid of the virus I had to go into the registry and make some changes. This was after deleting the virus file itself.

I went into the registry and did everything according to the "how to" document on Symantecs website until I got to a step where I was supposed to change a key so it would not be pointing towards the logon file that the virus created, but the original.

My experience with the windows registry is very small and I couldn't really see what to do here, so I went ahead and did the next step figuring I would go back to the last one later.

The next step was to delete a logon file, which I did (DOH!), and that was when the problem started. Windows crashed and I had to reboot, and now everytime windows is started it goes to the logon screen, (which never happened before now) says that you are being logged on, then a couple of seconds later you are logged out again. And this keeps happening.

I know this is a pretty rough outline of what happend but I can't remember the name of the virus, which means I can't tell you exactly which registry keys I changed. I do know however that the virus was created on the 10th. So it's a new virus and it's a trojan. I believe the extension was .sinit

All I need to know is how to get windows working again, that's my primary concern right now. Any advice would be greatly appreciated.

Thanks.

 

You should try the System Restore functionality.

http://www.ultratech-llc.com/KB/?File=RepairNT.TXT

If not, then go for a Repair via the CD.