Help with restoring WinXP to a 'defualt' state

Hi,
I'm not sure whether to post it in 'software' section or here, but the problem is a result of malware and all other xware, which has been (at least partly) removed from my PC.

Basically, I got my netbt.sys file infected, and removed by the MSE yesterday, I have managed to replace it with the file from i386 folder (or whatever the name is), but I still lack the registry - I dont have the whole netbt folder when browsing with Regedit

My system is WinXP Media Center 32bit with SP3.
Can someone please provide me with a 'working' copy, or at least guide on how to acquire one so I can get the internet working ? (writing from a laptop atm)

Also, I can't run any kind of safe mode (blue screen) while the normal mode works 'well'.
I have already done multiple scans with Malwarebytes, Superantispyware, MSE, Vipre, so which logs (and how to, since I'm not into it) should I provide you with?
Note: The blue screen is just 2 lines, and mentions 'WDFLDR.sys' file.

Lastly, when the internet was still working, I had random CPU spikes which:
were only appearing online (i.e with browser open) - CPU suddenly goes 80%+ and locks on 100% after few sec; so 'severe' even the mouse was lagging, which was weird since it works OK during prime95.
And the interesting part is: while Task manager, core temp and my G15 keyboard app were showing 100%, Process Explorer was showing usually less than 50% of the CPU usage during the lags.

I realize I ask for a lot, so thanks in advance to anyone willing to help. I also know that a C: format would probably solve all issues, but I don't want to do it yet becasue of <Read P.S.> and it takes 2x more time to set the PC up after the format

P.S This PC is a 6 year old Packard Bell, so it might be a challange to do anything related with windows CD (It's not a standard winxp install CD - has some pre-installed drivers, own menu)

 

got the registry from www.smartestcomputing.us.com/files/download/9-registry-network-keys/
The only thing left is the safe mode.
will check out the log instructions in a sec