First off all, please check the system requirements here:

http://download.bitdefender.com/resources/...s/datasheet.pdf

In order to Bitdefender 2013 on your machine, please follow the steps from below:

1. Use our uninstall tool in order to uninstall/delete any previous Bitdefender related files(2012, 2011, 2010, etc):

http://www.bitdefender.com/uninstall

Access the link and when the window with the BitDefender file appears, please choose the "Save to disk" option. Save the tool on the PC, run it and restart the computer when prompted.

2. Install BitDefender using the latest installation kit available for download. Please note that you need to download (save) the installation kit prior to running it.

The Bitdefender Antivirus Plus 2013 installation kit can be downloaded from here:

http://download.bitdefender.com/windows/in...r_antivirus.exe

The Bitdefender Internet Security 2013 installation kit can be downloaded from here:

http://download.bitdefender.com/windows/in...r_isecurity.exe

The Bitdefender Total Security 2013 installation kit can be downloaded from here:

http://download.bitdefender.com/windows/in...r_tsecurity.exe

The installer will automatically retrieve your license key so you will not need to enter it again during the setup.