Follow them all, and you've probably eliminated at least 95% of all potential problem sources.Things you should NOT do--------------------------------1: Use Internet Explorer2: Use any browser based on Internet Explorer3: Use Outlook or Outlook Express4: Open email attachments you haven't manually scanned with your virus scanner5: Open email attachments you were not expecting, no matter who they appear to be from6: Respond to spam messages, including using unsubscribe links7: Visit questionable websites (e.g.This is why you have backups of anything important.If you need a step by step guide, then google is your friend.That's why you put all that stuff onto a CD earlier.Then you can set about IMMEDIATELY downloading the latest security updates from Windows Update. After you've done all that, you can start loading on your usual assortment of programs.For instance, I'm assuming everything needs to be cleared out, but how? Well, formatting gets rid of everything, so you don't need to worry about that.If there's anything you want to save, you'd best be putting it onto CDs, DVDs, flash drives, or whatever else you can.
I too am on Windows XP and for at least two weeks now, have had the EXACT same issues that you listed from the anti-virus software not updating to the link redirecting to the wrong sites, mostly ones trying to get me to buy their anti-virus/spyware software. In the meantime, follow the instructions below: Please use a friend or family member's "clean" computer and download the Malwarebytes tool and it's manual update from the link below..I'm also going to include my list of things to do and not do in order to avoid problems like this in the future.TIPS FOR A SMOOTH RUNNING SYSTEM================================The more of these suggestions you follow, the fewer problems you should have.After that, run a full system scan and delete anything it finds.Malwarebytes Download Link (Clicking on the links below will immediately start the download dialogue window.) Manual Updater link the program installs correctly but then won't run, please access the "C:\Program Files\ Malwarebytes Antimalware folder and rename the "mbam.exe" file to something else..