In Windows XP:1. Click on Start.
2. Choose All programs.
3. Now click accessories, then system tools.
4. Now choose System information.
If the processor mentioned is x86 then you have a 32 bit processor. If its mentioned x64 Edition Version then this means it is a 64 bit operating system.
For Windows 7:
Now before downloading any software or driver, check the platform and system information for absolute compatibility of software with operating system and processor.
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