My advice is this. Use any other browser than Internet Explorer to move out of the line of fire between malware writers and Microsoft.
Your post didn't tell what browser and if your XP has all the critical updates. It also didn't tell if the machine is free from parasites. Read http://www.doxdesk.com/parasite/
Last week WinXpPro told me "unable to start Windows" at boot-time.
Recovery setup was neccessary.
From that moment all seems to work just fine except for all kinds of images on websites. They sometimes do not appear or only for some part and ALL animated gifs just show one instance of the picture.