Windows 7 - App Crash & Aero Theme gone

Hello Expert Guys

Please help me on this.

I was trying to install DVD player software but some how it started giving the messages of Application Crash and changes the theme (because of compatibility problem). After that i restarted my PC and the message came PC was not able to restart properly so automatically it went under Repair and i just pressed OK.

After all these process i got my logon sreen back but when i entered into it, Theme was already changed to basic. I then tried to restore aero themes but no success.

I tried windows help on Aero, which give the below message.

"find and fix problems with transparency and other visual effects"

I clicked on it and it went through whole process of checking and diagonosis but finally the message came, problem could not be solved with the below reasons:

Aero theme is not supported - Not Fixed.
Desktop Window Manager is disabled -- Detected.

I then searched over google for possible solution and found registry hack to enable Desktop Window Manager but that too did not solve my problem. Please help me on this as i want my aero theme back. Also, i did not create restore points so i don't have opiton of restore to previous date.

I found this site very informative and solution-oriented, so please help me to get my aero theme back with all its visual effects.

Awaiting for your feedback.

check your device manager and check your display adapter... you may need to re-install your graphic cards driver...

Dear

I reinstalled the drivers of Display Adaptors but still no success.

Kindly help.

Thanks