Big Problem - Oh Boy HDD Cannot Be Found

When I install windows, Generally what I do is copy all my software either extracted or I ISO it on to my hard drive because I'm really bad with CD's and scratching. So basically what I do is Split my HDD into 2 seperate partitions, it's been like this forever

Anyways, a couple days ago I had an issue with vista where my user profile became corrupt, so not a big deal because I got 2 seperate partitions right, so re-installing would be a breeze... So I went ahead and did that, but after I formated, I noticed that the only CD i had around to install was XP-Pro-64-bit so I popped that badboy in the drive and installed XP-64 and upgraded it to Vista-64 because I couldent find my Vista CD anywhere (Not really an upgrade but it was the only way to access my install)

Heres the Issue:
After installing Vista 64-bit the Drive Letter did not show up in Explorer (Wtf?)
I right clicked on my computer, went to manage. There it was... The Partition space still listed as NTFS Logical (thank god I didn't lose anything)
I right click it and go to assign a drive letter and I got the following error

'The operation failed to complete because the Disk Managment console view is not up-to-date. Reafresh the view using the refresh task. If the problem persists close the Disk Managment console, then restart Disk Managment or restart the computer.'

So I did that and it keeps giving me the same errors, I restarted both the computer and the Disk Managment console.

So i installed Acronis Disk Director Suite.... Checked it out, same deal no drive letter, Logical NTFS partition... I right clicked it to explore it and I could see everything... But attempting to assign a drive letter "D" in Acronis says 'Operation Completed Successfully' so I rebooted, and the problem still persists. It isn't in Explorer and Drive letter "D" has not been assigned.

Strange, this is the drive that I installed Vista from. it should work non?

- Other things I've tried "Disabled UAC" (Someone said this might help, but it didn't and hes probably a noob)

I've tried using the "Diskpart" utility in a Dos Emulation Shell but I really didn't seem to know what I was doing there... When I list my partitions in the Diskpart utility I see Primary, a Logical and Extended

1 Primary (My C: Drive with Operating system is listed as: 178GB Offset 8033MB)
0 Extended (93 GB Offset 93 GB)
0 Logical (93 GB offset 93 GB)

There is 8033MB unallocated on this drive as the Primary Offset is refering to....

So basically the drive that I installed Windows Vista from, Simply will not show up... There were some threads I read that the Partition may have been changed durring the XP-64 Setup?

Please help I can't install any of my nessisary programs, or listen to any music... the only drive letter I have active right now is the one thats SUPPOSED to be dedicated to Operating Sytem & Program Files only... So I'm kinda screwed right now Timely assistance is much appriciated.