I just started getting this Error message under 64bit Vista Ultimate?

Hi

Home computer on VISTA Ultimate-64bit.  Two individuals are registered to log on.

From today when log off one user and prior to see the logo for two users a small rectangular screen apper in the middle of the screen with the following

Run DLL

Error in:C:\windows\system32\NVCP.DLL

Missing entry:NV Session Start up.

Does any body know any solution?

Thanking you

Snow

Intel Viiv Dual Core E6400 [2.13Ghz, 1066Mhz]

Memory Dual Channel 3072MB [2x1024 & 2x512] 533MHz DDR2

Graphic card: NVIDIA GeForce 7950 1GB Single

Sound Card: Sound Blaster X-Fi Xtreme music

DVD +/-RW[read/write] 16x max and DVD [Reader] 16x [2 drives]

Dell Wireless Bluetooth Keyboard & Mouse Wireless Bluetooth

Genuine Windows VISTA 32 Bit with Service Pack1[Promation that was given away by Dell was accpted by me:

"English Media Centre 2005 to VISTA Premium Upgrade by going to www.dellvistaupgrade.com before 03/31/07]