Ok, backstory: I got the MS Antivirus 2009 virus from blindly downloading this file. I had Teatimer (or whatever program the S+D bot uses in the background) tell me some suspicious changes and all that stuff, so I run ComboFix. ComboFix seemingly fixes the problem, as the newly added shortcut to the MS Antivirus on the toolbar was gone. So I restarted my comp, just for good measure. This is when my comp starts failing. Login stalls for a while and takes a long time to get to the desktop, so I looked in my system32 file and looked for recent changes. I saw that there was a new file (svchostw.exe) which I googled. Seemed suspicious so I deleted it and tried restarting. Same problem occurs, stalled load to the desktop, internet doesn't work, auto shutdown because of RPC failure by NT Authority\system, and a svchost.exe application error with soemthing about the memory not being able to be read, so I was thinking the virus was still there. After trying a bunch of other stuff, I deleted my userinit.exe (33kb file) thinking it was one of the problems. Horrible mistake? So now when I login, it logs right back out and gets stuck on 'Closing Network Connections' + pretty much the same thing happens in safe mode, but even worse since I get the auto shutdown message from NT Authority\system. Another note is that I can not access task manage either as it gets stuck on the 'Closing Network Connections' box.
(sorry for the tl;dr)
I posted all the information I can think of, but I can't post the combofix log or anything since I can't even get to my desktop. So is there anything I can do to save my computer now? I have the Windows XP CDs from my friend, but I can't even figure out how to reformat it now. Please help.