cramrav

@ Alexx69, Yes, I already tried running the installation as as administrator and I already have Windows 7 SP1. Still, no improvement in the installation.

Just did the rescue CD and no threats were found. Still the same problem with the installation.

@ONT, My Bitdefender Internet Security 2011 (for 3 PCs) were working for my laptop and my current PC (with previous AMD processor and Abit motherboard). I changed my PC's processor to Intel with MSI motherboard today. And this is where my trouble with Bitdefender Internet Security started. No other software besides those…

And this ######. I tried to open an email ticket with BitDefender Customer Care but can't complete one saying the license key is not valid. But if I check MyBitdefender account, it says there that my license is still valid for 147 days. I think it's time to switch to another antivirus software.

I just did. Still no luck, same message. OS is Windows 7 Professional.

Hi ONT, Thanks for your suggestion. I did the following: a. System Requirements - OK, Intel Core 2 Quad Q8400 2.66 GHz, 3 GB RAM, at least 60 GB hard disk space b. Novice Steps for Completely Uninstalling BD - completed steps 1 to 5. However, still no luck. I still get the same error message: "'Some Installation Files are…