I have a problem with the internet explorer

When I click a site that I have searched for from search engines I am directed to this weird and random sites such as this:

and this: pt=2&rpt=1&kt=1

and many many more...

In order to get to the site I want, I must go back to the seach engine and click on the link again. And most of the times I have to repeat this step 2~3 times in order to get to the place I want

Does anybody else have this problem

Any ideas on how to fix it

I tried reinstalling the I.E., upgrade it to IE7, etc. but no use