Well I got windows 7 firewall I suppose?

I dont think I had a diffrent AV before this one on this computer

Besides, it worked perfectly fine yesterday, it was just when I logged on today it suddenly coudnt update.

When I first booted up my PC I just got a white screen too for some reason, forcing me to re-start, not sure if that has anything to do with it.

Might have to re-install maybe?