Wierd. I googled Win21:Evo-gen and can't come up with what kind of virus or malware this is supposed to be. The only results I got were links to the Avast forums.
Visual Studio Program / Debug Issue ( Win32:Evo-gen ... - 1 post - Mar 18, 2013
Avast! is removing winword.exe Win32:Evo-gen [susp ... - 6 posts - Mar 17, 2013
win32 evo-gen - 12 posts - Feb 15, 2013
Installing flashplayer generates "Win32:Evo-gen [Susp ... - 5 posts - Jan 30, 2013
More results from forum.avast.com ยป
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It seems Avast is the only major app that is reporting this kind of malware/virus. And look at the programs Avast is finding it in. I guess I should feel privileged in the company I'm in. :LOL:
Visual Studio
Winword
Flashplayer.
I don't know what you can do except use another antivirus program. There are several good ones. I happen to use Free-AVG.
Also, it's unusual that they don't let you put it an exception list. AVG has an exception list found in the advanced settings.
THEORY - you know everything but nothing works. PRACTICE - when everything works but don't know why. For me, theory and practice are combined: nothing works and I don't know why.