I am still undecided if I will keep BD 2010 anti-virus or uninstall and re-install BD 2009.
I've spent over 4 hours today trying to upgrade. The install just takes over the CPU allowing any other interaction almost impossible. Admittedly the issue was with my firewall software, ZoneAlarm requesting the okay to allow BD to perform some function. Because BD was hogging the CPU, I was unable to make the necessary mouse clicks to permit the requested action.
On top of that, after repeated reboots because the system just froze, once I was able to get things working almost normal, BD insisted that I had to scan my PC because a scan had never been done on the PC. So allowed it to scan to completion twice, only to have it tell me again after a re-boot that it had to be scanned because it was never scanned before.
System info: WinXP Home, SP3.
If the software continues to misbehave, I'll roll back to BD 2009 and start looking for a decent AV..
My biggest regret is having recently renewed my license for two years.
A very dissatisfied customer!