Historically there were complaints regarding v2.2. In response I never upgraded my prior system from the old reliable v1.6.2. I am not using SB at all on this new system as I find SAS and MWB sufficient. Since both versions are " All Windows versions" capable I recommend doing research as to current complaints. DA

ok you must have something else too in addition to the antivirus 2009 this is another program we use to clean this stuff it is also free get it and use it to scan. Malwarebytes' Anti-Malware v1.18 should be able to remove this pest ... download it to the desktop. * Double-click mbam-setup.exe and follow the prompts to install the program. * At the end, be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish. * If an update is found, it will download and install the latest version. * Once the program has loaded, select Perform quick scan, then click Scan. * When the scan is complete, click OK, then Show Results to view the results. * Be sure that everything is checked, and click Remove Selected. Malwarebytes' Anti-Malware v1.18

wait you don't have to take those off just turn them off while you try to get AVG to install and work. They are all fine good programs and should be on the pc. I would bet some of Norton may still be hanging in there causing the problem, so definitely use their removal tool for the version of Norton that she had that should clear up most of it. then go to right click start then explore in the tree> program files see if there is still a folder for Norton if so delete the entire Norton folder, anything you see labeled Norton or Symantec should go. You did not do anything wrong sometimes things just have conflicts and especially with Norton. So do the removal of that then just turn off those programs and try AVG again. The reason I suggest using the method in the AVG faq is that it keeps it from installing some of the extras that have caused problems on some pcs. It is a much slimmer version. You are doing a good deed! You are helping someone ,that is always a good thing. As I said it may require doing an add remove on AVG then reinstalling it, that is why it should be disconnected from the internet since you will be with out protection while AVG is not working. If AVG continues to fail you could try AVAST free, I use it on one of my pcs. avast! 4 Home Edition - FREE antivirus the install and user guide are on that same page off to the left. I do not use Vista so if anyone is aware of any conflict issue that I don't know about hopefully they will let us know.

I don't know the background of your major system issues but I can contribute that Windows does not permit Defender and Security Essentials to run on the same system at the same time. Pick one or the other...but not both. If Security Essentials won't install...it's likely that Defender has been activated. Go to Control Panel > Options > Windows Defender and check. Then check Programs and Features. If Security Essentials is still running on your system...it will be listed there. If you no longer wish to use it...click on it and Remove it. If you want Security Essentials rather than Defender...deselect Defender and try reinstalling Security Essentials.