I just found your post in the off topic folder that you posted to.
Check the PC date and time as this can cause the not responding issue. If it is correct, please contact OneCare Support -
How to reach support (FAQ) - http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~