Vista32 - 4G/b RAM - 2.5 Tb HDD

Working fine til upraded my MS Office 2003 to Office 2007 today, then it all turned to custard.

Before the upgrade I firstly set a restore point, then did the upgrade to Office 2007.

The install hung twice and wont' now uninstall.

Next, any attempt to load a Virtual PC (previously working fine) instantly got me the blue screen of death then auto reboot

Tried to return system to previous restore point but now claims there are none, 12 mths of restore points have just disappeared!

Then I realised that although I can see all files and folders in all HDD & DVD drives in any explore window, and all can be viewed in the device manager, none of those drives are visible in Disk Management.

The only drives it sees in Disk Management are two Flash USB drives, numbered 6 & 7. The rest of the drives (previously "0" to "5") have disappeared from the Disk Management screen.

Also in Device Manager, in Properties under the Volume tab when attempting to populate a popup error is displayed with "Vlume information for this disk cannot be found".

There have been no hardware changes for some weeks and this was all working until the MS Office upgrade.

Any ideas?