ntkrnlpa.exe
google lists this as spyware
got this from symantec
f W32.Petch has already been executed, it is likely that you will no longer be able to start Windows. While the damage that W32.Petch does varies with the installation path, once it runs, it makes numerous changes to the registry and deletes system files.
In this situation, replace the deleted files and the Windows registry either from a clean backup, or re-install the operating system.
so it looks like a reinstall
boot from the xp cd
choose install
ignore the first repair option and continue with install
when windows finds the previous installion and offers the repair
then repair
if you have sp2 installed you will not get the repair optipon unless you use a disk with sp2 slipsteamed into the xp disk,only the clean install
as soon as you get back up and running,clean the computer of virus ect.
follow greyknights instructions
http://www.greyknight17.com/spyware.htm