BitDefender Uneven Malware Removal

As noted, the preinstall scan found threats on all but one of my thirteen malware-infested test systems. It found and cleaned traces of over half the malware samples. The product installed without incident on all the systems, and I launched full scans. In a couple cases, BitDefender reported that the full scan alone couldn't complete its cleanup and suggested that I run the BitDefender Rescue CD. I downloaded and burned the Rescue CD, then used it to boot the problem systems. The attractive boot-time scanner did its job quickly; afterward a full scan ran to completion.
By default, BitDefender runs a full scan as soon as installation is complete. The first full scan on my standard clean test system took 30 minutes, slightly longer than average. However, BitDefender's ability to avoid redundant scanning of known safe files brought the time for subsequent scans down to just over five minutes. It automatically runs a full scan any time the system has been idle for half an hour. You can also launch a fast cloud-based quickscan any time you suspect the possibility of active malware—this is the same scan that runs during installation.