When I turn on my computer, it starts up normally, works for a few minutes, then freezes allowing me to do nothing. I can close any open windows. I can double click an icon on the desktop, an hourglass comes up, but nothing happens. The taskbar completely freezes. If I wait for around 5-10 minutes then it starts working properly again, that is if I havent turned it off and called it lots of rude names. I have anti-virus software (F-scure) which is fully updated and fuctional. When i run a scan it reports no virus found. Does anyone have an idea *censored* is going on? please help.