Ever mapped a network drive and it works fine, and then go back another day and it says

"Windows cannot access \\server\share"

Check the spelling of the name. Otherwise, there might be a problem with your network. To try to identify and resolve network problems, click Diagnose"

..and under details it says "Error code: 0x80070005 Access is denied."

Here is how to check (and remove or amend) the stored network passwords (works on Xp and Vista)

Start > Run

Type in:

rundll32.exe keymgr.dll, KRShowKeyMgr

This then brings up an application built in to Windows that lists all of the stored User Names and Password.

Sorted!

Follow-up - removing a current share (where it says it is shared, but no drive letter appears)

On the off-chance that this doesnt sort out the problem, another (even better way) is:

Start > Run

cmd (and then press Enter)

type in "net use" (and then press Enter)

This will list all of the mapped network shares. In my case, this listed my share I was having a problem with but with no drive letter.

To delete a share simply type in the following to your command window:

net use \\server\share /DELETE

this then removes the current mapping to the share, so that you can re-map it with the correct credentials.

Really sorted!