When I close IE and try to reopen it i get a error

[thehumbum]

whenever i open and close Ie and try to reopen i get the "cannot find server" message for every site.  Also if i stay on IE for more than an hour or so I get the message  and i cannot connect to AIM or any other program that uses the internet. PLEASE HELP. This is very annoying and gets in the way of my work.  Any help would be GREATLY appreciated.

[Flame]

Do you have virus protection? Spyware protection? Which connection are you using? (Dial-up, DSL, Cable, etc.) Also, which operating system are you using?

[glb]Flame[/glb]

[thehumbum]

Sorry how silly of me.  I am using windows XP home edition. I have Norton Antivirus 2003. No Spyware protection.  And I have a Cable modem with Charter as My ISP.  And I forgot to say in my original post that when i restart my computer the internet will work for another hour and a half, but will eventually just stop, and if i close and reopen it, it doesn't work.