Hi,
1. Are you getting error “update does not apply to your system” o9r something else?
2. What is the exact error message or error code?
Usually you will not be able to install different (64bit or 32bit) bit version in your computer. I would suggest you to install the correct version and check if it helps.
Update for Windows 7 for x64-based Systems (KB974431):
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=17142
Refer to the following Microsoft article for more information.
http://support.microsoft.com/kb/974431
Hope the information is helpful.