Personally, i have never used avast, though, if it does some firewall, i might have blocked ur program from going to internet if it accesses internet..
otherwise, i don't see how those three program might affect your computer...
__________________ lisp hacker 
running: FreeBSD 5.4 - still learning 
develop with: SBCL + emacs for lisp, Anjuta IDE +gcc for c, SPE for python..
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