Windows Crashes After Installing Bitdefender 2012

Dear Bitdefender team,

I had very smooth & pleasant experience with bitdefender internet security 2011, which led me to renew licence for the same product in 2012, But till now it has been turned into a total failure!

Soon after installation of this product, my system (Windows 7H 64 bit) faced with frequent crashes which finally after 1 week led to blue screen failure message!!! The only way I could get rid of that was uninstalling your product. After that everything went back to normal life. Recently after I read one post in this forum denoting the same complaint with some tips from your technical support team. I was encouraged, so I re-installed & updated it to the last build number 15.038-1604 but unfortunately again my windows started to work badly which finally leads to error message like below:

Error message title> Seccenter.exe-Bad image

c:\windows\system32\OLEACC.dll is either not designed to run on windows or it contains an error. try installing program again using original installtion or contact software vendor...

or another one as below:

Error message title> BTStackServer.exe - Application Error

the instruction at 0x0054c6b7 referenced memory at 0x000001ef. The memory could not be read.

I have to do force restart & again uninstall bitdefender internet security 2012. I really amazed why a successful security software can cause such bad impact! please help me to resolve this problem ...

thanks

Danaie