[jackv]

Any idea what this is?

winupd64x.exe

It keeps popping up for me to run program. I don’t know enough about these thing and am afraid to do so but maybe it’s just another update.

[Richard Kimball]

A quick google search says that winudp64x.exe is a virus.

Not recommending you use their clean up process, but here http://www.prevx.com/filenames/X678219248043914988-X1/WINUDP64.EXE.html is an explanation of the virus.

NOTE. You mentioned winupd64.exe which is slightly different.

[decimon]

Any idea what this is?

winupd64x.exe

A web search indicates it's a virus.

[RepublitarianRoger2]

Here is what you apparently have: A fake antivirus program called “Antivirus.”

Manual steps to get rid of it are here:
http://www.2-spyware.com/remove-antivirus.html