Kay, so you're on broadband
Have you looked into your anti virus and firewall settings to make sure that you're not being cut off in your prime?
You might have viruses/spyware & so on but I think re-installing the operating system at this stage is a bit severe.Have a ook at what you are & are not being allowed to connect through your security stuff.
If you're on xp, then you at least have a (weak) firewall. Go Start>control panel>security>firewall & make sure your browsers can connect. After that, check for the same kind of issues through your anti virus software - Norton, Mcafee etc. If no dice, then download & run CC Cleaner & Spybot Search & Destroy (both free) & if that's no good, then I dont know you, we never met.
