Crashes!!

When ever i play WoW and Guild wars i always get bout 2 mins into the game then it crash... the internet gos off then it keeps repeating same problem but its fine when im just on the internetSo could people tell me how to stop this plz?Its not my mcafee firewall well i dnt think it is :PCrashes!!
Could be mcaffee they suck but maybe somthing is over heatingCrashes!!
It's probably your Firewall because in Battlefield2142 i would get booted when i installed Comodo Firewall. Turned out i had to let BF2142.exe and punkbuster A and B.exes have full access and bypass security checks. Invisible connections and the like.
I was going to be constructive, but I've reconsidered being that you feel the need to type in giant yellow font.

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