Generally, a computer's bit count indicates how much data it can process, the speed with which it can process the data, and the maximum memory capacity. In order to optimize the computer's performance, the bit count of the operating system that is installed on the computer should match the bit count of the computer itself.
To find out if you are running a 64 or 32 bit addition of windows:
1. Select start
2. Type msinfo32 and press enter.
3. In the Item column scroll to System Type
In the Value column you will see the type "x64-based PC" or "x32-based PC"
This might be problematic if you are trying to install software that requires a "x64-based PC"
I hope this helps.