Please Please help me, Im computer is goin nuts w/ ~tmpi.exe

Hi everyone. After being on christmas vacation for two weeks, I cam home turned on my computer and could automatically tell something was wrong with it. It automatically went to a strange website whcih i closed. Im pretty sure my comp has a virus. Right now im running a full scan on McAfee and so far at 80% it hasnt found anything, whihc i think is weird, but while its doing the scan multiple pop-up keeps coming up that say "~tmpi.exe program has stopped working and windows will let you know when there is a solution". I looked online and found that this is a malware program, but dont know what to do especially since McAfee isnt picking anything up. I tried looking for the malware on my comp, but i cant find it either. Can somebody please help me? Thanks

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