Internet explorer is weird

[CVMichael]

Like a month ago I had the same problem, and I re-installed my computer, but don't want to do it again.

My internet explorer is acting strange, when I click on some links it does nothing.... on regular links is ok, but for links to download something it does not work, for example in most of the threads on this web-site, wherever there are attachments, when I click to download any of them, it just does nothing, as if I never clicked on the link. Also when I click on buttons on a web-site, like the submit button, the button goes down when I clicked it, but it does nothing.

Also, I use Windows Messenger, when I get new mail, I click on the thing that pops up, and again, nothing hapens, IE should open, but it does not.

So, anyone knows what's going on ? how to fix this ?

PS
If this makes any difference for you to figure out the problem...
I'm using Windows XP Pro
P4 1.4Ghz
384 RAM
3 hard drives
Web-server, FTP Server....