How to install;,
Run Patch.

All instructions are written in Patch Windows.

Follow those instructions carefully.

Enjoy your Registered BitDefender.

Cheers!!!
System Requirements:-:
    Windows XP with Service Pack 2 (32/64 bit) or higher
    * 800 MHz or higher processor
    * 256 MB of RAM Memory (512 MB recommended)
    * 300 MB available hard disk space
    Windows Vista (32/64 bit) and Windows Vista SP1
    * 800 MHz or higher processor
    * 512 MB of RAM Memory (1 GB recommended)
    * 300 MB available hard disk space
    Windows Home Server
    * 800 MHz or higher processor
    * 512 MB of RAM Memory (1 GB recommended)
    * 300 MB available hard disk space
    Internet Explorer 6.0 (or higher)
    .NET Framework 1.1 (also available in the installer kit)
    Supported IM Software (for IM encryption)
    Yahoo! Messenger v8
    Windows Live Messenger v8.5



:-:INSTALLATION:-:
1: Go to C:WINDOWSsystem32driversetc
   and open host file in notepad. B4 opening, open its properties and 
   uncheck its read only attribute.
2: Paste the following line any where in host file.
   127.0.0.1 matrix.bitdefender.com
   127.0.0.1 update.bitdefender.com
   and save it and close it.
3: Go to its properties again by right clicking on it and check it 
read only attribute. If you will not do it, u may get some error msg.
4: Install program and restart your system.
5: Disable Internet when you will be asked for key.
6: Use Keygen to get BDIS key and use that key for registeration.
7: Enjoy!!
   
   (NOTE: never regiter BD online. Each time u update, you may have 
   to generate new key to register so manual upadte is better. Even 
   changing key will never effects your updates which you have 
   downloaded and have installed. Update just Signatures, no need to
   update program.)


Direct download link 
http://download.bitdefender.com/windows/desktop/total_security/final/en/bitdefender_totalsecurity_2009_32b.exe