ShopperReports malware/virus

Something called shopperreports got onto my computer. Whenever I try to search for something it will pop up in any search engine with some products. I believe that it is causing the major problems with my internet, because my internet (Explorer) will randomly close as if I pressed the exit button. I need help getting it off, I already know that Norton Internet Security does not pick it up and the website it comes from shows up as safe. The problem with removing it is that it has written itself into my computer registry so I'm not sure if I should use system restore and I don't trust myself with going and deleting it out. I will not run windows updates because if I do then it will be my new restore point and then there will be no hope of using system restore to get it off. I have Windows XP Professional SP3 and Norton does its automatic update regularly. Also going to Add/Remove programs doesn't work even though it is on the list. I have seen some links to get software to delete but I don't trust random sites. If someone could please recommend a site/tool that is free and safe.