Reinstalling is a real pain for someone not familiar with PCs.

I'd do this:

Go into control panel and uninstall any programs you don't use. be sure they are programs though, like weatherbug, music downloading programs and things YOU have installed, except for virus protection. Don't remove ANYTHING that you don't know what it is.

Restart

Open internet explorer and got to tools menu and 'delete' temporary files and cookies (this may take a while).

Restart

If not working better now - seriously just replace it.