EXCEL.EXE is not a valid Win32 application

“EXCEL.EXE is not a valid Win32 application”

Huh? It was this morning.

I do love Vista SP1, but it has freaked out on me now and then. Last night I tried to open a spreadsheet by double-clicking on the .xls file. Windows told me that there was no association for that file type. I stared at the obviously false message for a while, trying to decide what to make of it. I briefly tried check the file association, and then just figured I’d run Excel directly, and got that error message.

I’ve noticed that this notebook I’m working on gets quite hot when it’s been on for a long time. At such times I’ve seen it flip out in ways I’m sure are hardware-focused, such as the video going all nuts and the system rebooting. Even though this didn’t seem like a hardware error I decided to shut down for a while and watch TV. When I got back, Excel and the file association ran fine.

Then, the next morning, purely by coincidence, I noticed a blog entry on the SBS Diva blog with the title “EXCEL.EXE is not a valid Win32 application”. The entry referred to Knowledge Base article 952709 and a “reliability and performance update” (i.e. hotfix) that fixes it. I applied the hotfix and the error hasn’t reappeared, but I haven’t exactly stressed the system since then.

The hotfix addresses several problems, including mine:

  • Crashes in Windows when checking POP3 mail, when certain types of security software are installed.
  • The system may stop responding when you delete user accounts in the User Accounts control panel.
  • “…large applications cannot run after the computer is turned on for extended periods of time.” For instance, “EXCEL.EXE is not a valid Win32 application”
  • The system crashes in Windows Live Photo Gallery when using the Apple QuickTime thumbnail preview.
  • Reducing audio and video (AV) stuttering when streaming high definition content from a Windows Vista SP1-based computer that has a NVIDIA network adapter nForce driver version 67.5.4.0 that is installed to a Windows Media Center Extender device.
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