To purchase the correct disk you will need to know if you have a 32 bit or 64 bit Operating System installed.
One way to do this is to...
- Click start
- run
- msinfo32.exe
This will eventually pop up a window that looks like...
You are looking for 'System Type
If it is 'X86-based PC' then you have a 32 Bit OS and if it is 'x64-based PC' then you have a 64 bit OS.
If it says anything else, then you are on your own!



