hijacked homepage can some 1 please answer me ? to solve this

got windows xp now for days i keep getting your internet explorer settings have been changed search something or orther it says some website it got changed to this is. and would i like to restore old settings or keep new settings but no matter how many times i do this it sorts it out there and i dont see it then. but after turning off pc then putting it back on again this keeps comeing up please some 1 sort it out. ive run cw shreddar spybot spysweeper search destroy. done me virus scan defrag scan check disk. and yet it stil pops up when i put pc on running xp home can some 1 say why this is.

 

Click start, then run and type services.msc in the dialog box and hit enter. Locate Messenger in the list, right click the entry and select stop. Right click again and select properties, then set to disabled. OK out and close the window.

Download HijackThis from the CWShredder link in my signature, in the Official Downloads section. Save it to a permanent folder (I create a new folder in C:\ named HJT). Open and hit scan, then save log. Once it is saved it will open in notepad. Select all from the edit button, copy and paste the results here. Don't fix anything with it yet! Someone experienced with the logs will advise you.