VPSMATE

Some bit of indigestion during an update has left one of your system reserved partitions on the hard disk hanging out. I don't think anybody's come up with a set-in-stone solution yet : the problem appears to be random, sometimes disappearing after a few
days. (you can Search these forums for other similar issues)

But, seeing as it's been a few months, if you're feeling adventurous, you could run DiskPart and try and remove the letter.

Open up a Command Prompt (Administrator) : then select from the Powerusers Menu...

Start typing...

C:\Windows\system32> diskpart

DISKPART> list volume a list of all your lettered volumes should appear

DISKPART> select volume n substituting the number
corresponding to your z drive for 'n'

DISKPART> remove letter=z which removes the letter, not the partition

DISKPART> exit

If that works, restart and see if the change is persistent.

If horrible things start happening, reverse the process... list and
select as before then

DISKPART> assign letter=z

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