XP Login Error Cycle

[trigun]

So I recently checked out my old laptop (win xp media center ed.), which sits in the living room and I let anyone use because I have a new one, and it was behaving very slowly. I haven't touched the compy in over a year, so i wasn't that surprised. People use it for youtube, imdb, and random online time wasters. I ran a Malwarebytes on quick-scan and found a ton of junk on the lappy. I told the Malwarebytes to remove and it told me to restart. I restarted my computer thinking I would do a series of follow up full scans. When the system rebooted, I was confronted by a different xp login screen than I normally see (running in window this time) and when I log in, it starts to go, then says it is saving, and cuts back to the log in screen.

This kind of pissed me off, so I gutted the drive and installed it in my desktop to run further AV. After running all the programs and catching several more viruses i thought i was in the clear. Popped my drive back into the lappy, but I am still confronted with the same login cycle. I did a little research and it seems that I have a registry error or something.

My question is how I should go about fixing said error. My laptop is stuck in the login cycle, so I can't run programs on it, and the laptops dvd drive is dead (so no xp repair disk if I had one). I have a working Win 7 desktop that I can pop the drive in.

Kind of hit a wall as far as where to go now, any suggestions?

[prairie dog]

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