I just want to know how I can change my homepage because I have changed it through internet explorer properties, but the same webste comes up no matter what. I have windows xp pent. 4, the website that comes up is http://www.securitybulletin.net/, it apparently overided the internet properties. any suggestions.

Your computer has a browser hijacker related to the Smitfraud intection. Try the removal instructions for smitfraud and its variants here:
http://wiki.castlecops.com/Malware_Removal:_SpyAxe_Removal

If that does not fix the problem, you may also be affected by a trojan and should submit a request for help at a HijackThis forum such as this:
http://castlecops.com/f67-Hijackthis_Spywa...jans_Oh_My.html