XXX is not a valid Win32 application

If you have used your Vista SP1-based computer for extended period, you may experience some problems starting large applications, for example, Office 2007 applications. Specifically, you may receive a message “XXX is not a valid Win32 application”.

If you do experience this problem, you can install hotfix KB952709.

https://support.microsoft.com/kb/952709/

Comments

• Anonymous
  August 05, 2008
  You shouldn't need the hotfix; It's already been pushed-out through windows update. I got it on 2008-07-09...