Hi,
conner2u, and welcome to the forums.
If you cannot do any of those things then something is wrong with your computer. Without more information all I can suggest for *truly* fixing it in a one stop is to format and reinstall Vista from scratch - because , after every install I ***CAN***
run programs download anything online use my voip telephone anymore make temp files
I highly suggest that you give us more detailed explanations of what is going on and what you have tried to do to fix it.