I have a problem..

[Macdaddy_93]

Hi Guys, newbie here with a problem!

I recently had to restore my pc as i had a virus present. Since doing so i have the following problems:

1. Audio is choppy when double clicking to open a programme

2. When i sign into youtube it automatically signs me out everytime

3. Ebay & facebook wont load properley and just hangs

Im using Firefox 3.5.6 & IE8, running windows xp home, sp3.

Any help appreciated.

Thanks