go back to 32 bit I have discs

I want to install an update to Outlook but there isn't any for a 64 bit system. How do I go back to a 32 bit setup. I have both discs

Go to this thread: How to change win 7 64 bits to 32 bits?

It tells all about how to do it.

Be advised, switching from 64 to 32 or visa versa is a very drastic move - it means a complete reinstall of every program.

Is this a security update? It is quite possible you simply do not need the update in 64-bit because it isn't a vulnerability there.