Terrible program. Slowed my system down to a crawl, and made it randomly blue screen. I had to reinstall Windows in the end. I traced it back to some weird interaction between BitDefender and programs that mount/unmount network drives on the fly, such as WebDrive (and perhaps Daemon tools). Would never install it again - and why would I since it melted my system and wasted a week of my life?
It slows my system down to a crawl, and results in crashes. It seems to interacts badly with any program that maps network drives, such as WebDrive, Daemon tools, etc.