The start up page of my Windows XP of blue sky and green grass has been replaced with an internet page advertising anti-spyware measures. It has resisted all attempts to remove, including Skybot Search and Destroy. Any ideas as to how to remove permanently?
adaware and a² as Dan the Confused suggested coupled with spybot sd are always a good starting point along with an Anti Virus.
Can i suggest that you also download and install BHODemon 2.0 from click here , it is possible this might pick up the offender if it has installed itself as a BHO.
It would also help if you could say what the name of the software is that is being advertised and if you have downloaded anything that might have caused this , anything useful that might pinpoint a file name etc to give helpers something to go on.
As said above you can also download the latest version of Hijack this .