so it seem like u are really download something from internet har.......
if u post this right after u get the infection i should be able to help u....
cause i having experience from getting spyware and it will malfuction ur anti-virus(replce ur anti-virus start-up EXE with a fake one)
i not sure ur computer is virus infection or spyware
my trick is like that:
1.i go safe mode try to found out the date that i get the spyware, i search all file that being created in that day and i delete them all.(this step is to delete most of the file that will become a virus downloader)
2.of cause not all file can be deleted since they run right at the startup of window even n safe mode,try to open tast maneger to terminate all strange or unusual .then i download a anti-spyware to delete them.(the register part i cannot help u since mine still having problem and i just ignore them)
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***but ur problem is ur computer having the infection for quite a long time so this trick will delete the file being created in this period***
are ur computer slowdown???
ya,u can also try to use my trick.delete all file that same day with the song u have downloaded.(do in safe mode)
cause i not so familar with the window register part so i cant really help u much...Zzz
try the trick see does it work or not(maybe a virus block u from run exe staff)