a setiface erorr occurred 536870929 try to reinstal or contact support

hi, i have vista home 32 bit, my avast pro expired so i reinstaled somehow with erorr so doesent work at all i get the same erorr # to
i did have some problems with widows defender couldnt get updates automaticly so i updated manualy (if that have anything with this ) wants me to either reistall or contact support cant reinstal wont let me remove the program …i did have avast pro before and it worked fine i can still go online and surf but witout any protection if needed any other info here let e know i do need help about this saince my computer skills arent sharp thank you

I suggest an installation from the scratch:

  1. Uninstall avast from Control Panel first.
  2. Boot.
  3. Download the latest version of Avast Uninstall and use it for complete uninstallation. If, for any reason, you can’t run it, try booting in Safe Mode and doing it from there.
  4. Boot.
  5. Download, save and install the latest avast! version. You need to be on-line to do so. It will be good to accept the boot time scanning on next boot.
  6. Boot.
  7. Check and post the results.