Internet problems windows 7?

ever since there was this new update for windows 7, I constantly have internet problems, my connection keeps disappearing and appearing over and over again. I tried a different virus program, change my windows firewall, and putting windows back into an older version. but it just doesn't help. for my... show more ever since there was this new update for windows 7, I constantly have internet problems, my connection keeps disappearing and appearing over and over again. I tried a different virus program, change my windows firewall, and putting windows back into an older version. but it just doesn't help.

for my home-network I got two linksys routers, one upstairs and one downstairs.
but they both work fine because my dad has got constant internet on his laptop.

what can it be?
2 answers 2