Hi guys and girls

Faving a bit of trouble with the ol' tinterweb over the last few days. I am connected via a belkin wireless network, to Plusnet ISP. Normal browsing is ok, but when loading up pages with a few pictures in it slows right down, youtube etc videos are a real no-no. Used to load videos etc straight up, but now takes a few mins to fully load.

Have tried resetting the modem/router but with no luck. The main computer that is connected straight to the modem (not through wireless) is also being very slow.

Any ideas at to what could be causing it? Anything that can be done?

Thanks in advance

Rich