Windows

Sounds like something is hijacking your homepage.
Possibly a piece of Spyware.

Firstly, open Internet Explorer and click tools and then click internet options.
(Another way is to double click My computer > control Panel > Internet Options)

In the window which has opened what is the address of your homepage?
Does it say somethin like http://www.google.co.uk/
or does it say something with ad.doubleclick.net?
If it says something with doubleclick.net then change it to http://www.google.com and see if this helps.

If it doesn't the cut and paste the following line into your browsers address page

http://download.com.com/3001-8022-10214379.html

This will download LavaSoft Adware. Run the program and it will remove any spyware on your PC.

HTH

i already had Spybot S&amp but i still downloaded Ad-ware 6.0 so i did what you said but still the same thing, i also downloade a RegCleaner and cleaned it but still the same thing.
any other idea on what i should do to fix this anoying problem...
thanks,

Try clearing out your Temporary internet files and your cookie, also in Internet Options, just in case something is lurking in there.