HELP - missing files and disc-space after upgrade from Parallels Desktop 4 to 5

Hi there [See the update...],

I've got a serious problem right now...
Running Mac OS X 10.5.8 on a MacBook with Vista...

I have just upgraded my Parallels Desktop 4 for Mac => Parallels Desktop 5 for Mac. The upgrade went smoothly but when I planned to open a document which I know I had on Z: (the Parallels Desktop 5 on '.psf') - it's not there any more... I now found that the whole Z: drive have been replaced and heavily reduced from some 150 GB to 266 MB...
My C:Vista is 31,9 GB - so there are some serious amount of disc-capacity missing

So my problem is:
- all the missing files that used to be on Z:Home - are they completely gone ??
- the missing disc-capacity - how do I retrieve it ??

HELP !!!



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UPDATE:

I have now completely rebooted my MacBook and now the Z: turns up as Home again... Just like it was before.
I did reboot the Windows Vista and Parallels before, but it seems that was not enough. But now all is GREAT again.
Sorry for this post, I guess one gets a little stressed when you seem to have lost lots of your files (and disc-space).

All Good and Thanks for checking !