"QueryDosDevice failed" What does this mean ?

Googling "QueryDOSDevice failed led to threads like this:

QueryDosDevice is a Windows function used to look up mapped drive letters
(C:, D:, E: etc.) When you open Windows Explorer, are all of your drive
letters displaying normally and accessible? Are you running any third-
party drivers that use a drive letter for a special device? Have you
tried booting into Safe Mode?
http://support.microsoft.com/kb/315222

And this:

"OK, I hate to tell you this, but I still don't know enough to help you, except to advise you that your system MIGHT be infected with some type of malware. The message you're describing might be adware designed to scare you into clicking on something... ESPECIALLY because you got this message AFTER opening Yahoo! Messenger..."

If neither of those turn out to be the issue, try google and scan the threads. Sorry, that's the best I can do.

Thanks for the come-back. I did go to Google and ran a surch on it. However they do not say
what the cause is.

But i will keep at it, and share whetever results i get.


Thanks again for the input