The OS turned out to be XP 64 bit.
http://download.cnet.com/Avira-AntiVir-Personal-Free-Antivirus/3000-2239_4-10322935.html doesn't list that OS!
I tried downloading the new free version of Avira AntiVir and the file said there was an error. I get the following pop up message when I turn on my laptop:
Avira AnitVir is not compatible with this version of Windows. For more informaiton contact AntiVira.
What can I do to solve this problem? I have Windows Vista and this program has been working for me for the last year and a half. now all of a sudden it's not compatible.
Thank you in advance for your help.