Protegent Antivirus is compatible/supports both 32 bit and 64 bit operating system, so users need not to worry about the Windows bit version.
To find out if you have a 32 bit or a 64 bit operating system, follow these steps:
For Windows XP:
If you do not see x64 Edition listed, you are running a 32 bit version of Windows XP.
For Windows Vista , Windows 7 , Windows 8 and Windows 8.1 :