Javascript causing trouble i think...

I cant use the buttons on Yahoo! email, I cant use the buttons on forums, i cant use anything that uses javascript, and when I right-click on something in a browser, I get an Error running scripts, with no error data displayed. ANy ideas? or do i just need to wipe my comp? Its been about a year...

What browser?

Stuff like Norton internet security blocks certain stuff from running in internet explorer.

IE. I turned off Norton, and it still didnt work... And i had Norton installed for at least 1.5 months before this started.