There are 3 different issues in 3 different machines I faced while running BitDefender 2012, as listed below.
PC-1: Windows 7 Ultimate 32 bit
Whenever there is any USB pendrive is plugged with the PC and ran a virus-scan, the 'Dont show hidden files' from the Folder option is automatically turned ON. Note that, that PC always has the 'Show hidden files' enabled; so when the option is switched automatically, it can not be turned to the 'Show Hidden Files' settings without restarting the PC after the virus-scan is finished.
PC-2: Windows XP Service Pack 3 32 bit
From the BitDefender setting, under Antivirus, the user has 'Automatic Vulnerability Scan' turned OFF all the time, but everytime BitDefender 2012 completes an update, the setting is automatically turned ON. This PC is also facing the similar problem as mentioned for the PC-1.
PC-3: Windows 7 Service Pack 1 64 bit
Few sites have been very slow and rarely opens when it runs BitDefender Internet Security 2012. Note, those same websites open without any problems in PC-1. Also, PC-3 doesnt face this problem when it runs BitDefender IS 2011 trial.
Please have a solution for this.