Just follow the below process to know whether your computer is 32bit or 64bit
- Start -> All Programs -> System Tools -> System Information
- Check for the "System Type"
For your information :
Difference between 32 bit and 64 bit : The main difference between a 32 bit and 64 is that 32 bit system has 4gb(gigabytes) of space for addressing means that the 32 bit system has a limit of 4GB RAM to process data where as the 64 bit operating system has 2^64 bits of space to address and supports 16 hexabytes of RAM to process data.