Hi and Welcome :emotion-1: The helpers on this forum will need some additional information in order to help you.         Why are you installing an anti-virus now, rather than in the past?  Are you currently experiencing symptoms of infection? It might be good to try some online scans to see if malware may be blocking the installation of Avira. Perhaps start with an online scan here:[URL] scan works best with IE. Alternate browsers require downloading and installing the ESET Smart Installer.•    Accept the Terms of Use: •    Approve the install of the required ActiveX Control, then follow on-screen instructions.  *  Disable the protection of your resident anti-virus program after installing theactive X control that Eset has installed and again when you actually start scanning.•    Make sure enable (check) the Remove found threats option is checked, and run the scan. •    After the scan completes, the Details tab in the Results window will display what was found and removed. A record of these results will be found here: C:\program files\esetonlinescanner\log.txt. This online scan may take quite a bit of time to complete so please be patient. If necessary, allow the scan to run overnight. Please do not use the machine to do anything else (e.g. browse; check email; chat) until the scan completes.   
hi, I m tring to install avira antivirus personal on windows xp with sp2 and not able to install it. I tried with firefox first and after downloading the file which is shown by download status as completed but not able to run after so many times even after restarting the pc.And if I try with ie 8 after downloading that file with 29mb and try to run that file I get error "windows has detected a serious problem with this file".I don't have any antivirus or antispyware.Previously I had malwarebytes and superantispyware which I removed successfully from add/remove programs and also deleted some manual entries from registry,progrms files,documents and settings etc but not getting any sucess so plz help me through this
Avira antivirus