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This sounds like a more nontrivial problem. Try posting a question to the MikTeX forum or the MikTeX mailing list .
BTW, you should never disable the UAC. Any application that requires this is flawed.
Thanks for the info. I posted to the MikTex forum as you suggested but no answers yet. I still ...

If you want to know what command is run to uninstall, you can get it from the registry. In regedit navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\MiKTeX 2.7 (it might be HKEY_CURRENT_USER , depending how you installed). The UninstallString contains the command ...

No idea; I've never used Vista (and never will). However, I've installed and uninstalled MiKTeX on Vista systems for some colleagues and never encountered any problems with the UAC.
Edit : if you deactivate the UAC, do it on a temporary basis to avoid compromising the security of your system ...

This is another example of the UAC problem that Tomek mentioned in this other thread . Try to deactivate UAC (google: "deactivate UAC vista").

Thanks a lot. I first thought about applying Tomek's suggestion to do the uninstall, but I didn't know how to run the uninstaller as an administator.
So ...

I installed MikTex in a Vista laptop a few days ago. I wanted to uninstall it in order to re-install it for all users on the machine. But when I try to uninstall from "Remove Programs" I get "Windows API error 5: Access is denied" and it is even hard to quit the wizard after this happens.
Does ...

Thanks for this information Tomek. The problem here may be that I am a windows guy and have been spoiled to expect things to work without having to figure out how it works behind the sceenes. I am also new to LaTex. I just started looking into LaTex a few days ago as I wanted to use it to post math ...

I just installed MikeTex 2.8
I was missing fancyhdr.sty so I tried to use the Package Maanager to install it.
But I got the error mesage:

Windows API error 5: Access is denied
Data: C:\Program Files\MikTex\doc/latex/fancyhdr

I did a "copy info" and this is what I got:

MiKTeX Problem Report ...