When I visit some web-sites, most of them, the words on the screen are large and they overlap themselves. I can't read the words or access any links. How do I fix this problem?
what browser are you using ?
didn't you happen to increase the font size ?
while in your browser (Firefox), hold down CTRL and scroll the mouse wheel up or down to get bigger or smaller display, if that's what you're asking
That happens only on Internet Explorer.
I bet you do have one, maybe IE 7.0?
Anyway, the first option is to reinstall your browsre, if that doesn't fix it, maybe it's a malware problem ( Internet Hijack ).