Hello, and HELP! 
I installed BitDefender just immediately before going on vacation a week ago. Upon my return last night, I was able to boot up my XP system and all seemed okay. At 3 a.m., my system got an automatic update called Software Distribution Service 3.0, which I assume is a Windows update. After that, the computer did an automatic reboot and then the system was completely frozen.
After fiddling with it for several hours today, I finally was able to use Safe Mode to restore the system to a prior date, before installing BitDefender. That worked so that I am able to use the computer. I did try various other things first, restoring to a previous date and then re-installing BD. As soon as I rebooted after the BD installation, the system froze again.
Is there some conflict between BD and Software Distribution Service 3.0? Or could it be that there's some conflict with some other software? At this point I have no virus protection, which is not good, obviously. Since I paid for BD, I'd rather use it, but if no-one has an answer I'll probably get McAfee or Norton.
Any ideas on what could be going on? All ideas are most welcome -- thanks!