It's windows 8.1 who claim he want signed prog (signed with payment) .
Just answer "YES" to run it .
There is no virus,perhaps a rebuild of it can stop this ask.
The sdk 32 and 64 have constants switchs for windows 8.1,you can skip this step if you have it
Later:
I have put a cpusys_build8.1.zip on the first post,perhaps he ask no question.