I posted this over in the Tech forum also but hoping for quick replies and help with this so I can stop it before it causes damage to my system. I am running Windows XP. Yesterday I noticed my computer running very slow and wouldn't connect to the internet. Im running Kaspersky AV 2013 and definitions are up to date. I ran a scan and it showed no threats.I did a system restore of a previous day (3 days back) and everything seemed ok. I have a free copy of Malwarebytes installed. I updated it and ran a quick scan. It found 789 threats of something called PUP was in my documents/settings. I deleted them out, reset my Firefox home page which had been changed to some blank AVG page. Overnight I ran the full scan(5 hrs) on Malwarebytes and it showed the same 789 objects PUP again. I deleted them again and ran a AV scan and the AV scan found nothing. What is this PUP malware? How harmful is this and why does Kaspersky not pick it up or block it? How do I get rid of it Hijackthis? Any useful programs to get rid of it?