W8nky computer

Guys,
When I switch my comp on it all works, but then after a few mins there is a major freeze for about 2 mins. The mouse cursor still moves and you can double click on icons but nothing happens. Then all of a sudden everything that you clicked on comes up and the comp carries on as normal.. I know very little about the mechanics of a comp, so does anyone have any ideas?
Cheers
Paul
When I switch my comp on it all works, but then after a few mins there is a major freeze for about 2 mins. The mouse cursor still moves and you can double click on icons but nothing happens. Then all of a sudden everything that you clicked on comes up and the comp carries on as normal.. I know very little about the mechanics of a comp, so does anyone have any ideas?
Cheers
Paul