internet playing up

[-Tigger-]

hi guys, for some reason.. my internet will only load a handful of sites up, no settings have been changed, ive done a spyware/virus scan on this PC, although the net is playing up on the other PC aswell, i checked the router and everything seems fine, i done a factory settings reset and filled it out again, still no luck

is this a router problem or more likely to be my exchange?