Revo Uninstaller Pro (rev. 2.4.1 current) is fantastic. To verify leftovers (to add to prev. post,) click on "Forced Uninstall," and navigate to C:\ProgramFiles, etc., and locate the MSO program file. Note: If you're performing any Advanced Uninstall process, make sure you're reading what the checkboxes say. Even the most reliable programs can, at times, tag incorect software.
If leftovers are stuck in your Add or Remove Programs (appwiz.cpl / Control Panel) list, the "Windows Installer Cleanup Utility" / aka msicuu2.exe/msizap.exe is no longer published. Send me a private message, as I archived this (may be on my profile.)
Another way to remove erroneous .msi entries is to use Piriform's freeware CCleaner and to "logoff" (delete the entry," but if you're not using Elevated Priveleges, you may get a "cannot delete MSI installer" edit.
I thought I'd also mention that, if you have additional bloatware (which, having just bought a Dell Studio laptop, I'm always stuck with myself,) that programs like the Activation Assistant for Microsoft Office may need to be uninstalled in a certain order, as so that they don't "resist" being removed. Ideally, you'll want to start with the add-on-type stuff first, and ultimately remove Office last.
Some stuff may want to be left behind, such as a "Compatibility Pack for 2007 Office Systems," say if you have or plan to run MSO 2003. I personally like 2003: Simple, easy to use, no fancy schmancy clicking around. However, the usual .doc (MS Word) files aren't what others use. If someone emails me a 2007 Office or 2010 Office (MS Word) document, it could be, for example, a .docx format!
FileFormatConverters.exe (that CompatbilityPack) hotfix I mentioned earlier fixes that and lets you read both easily. However, note that you may be stuck getting offered WindowsUpdates that correspond with MSO 2007 as well! You can always right-click on anything like that and choose to hide it, but it's recommended to not omit anything security (vulnerability)-related.
Hopefully this 2-cents helps... I've personally been through a lot of guff w/ preloaded MSOffice programs, especially versions one can't even use without a product key!
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