Standby Mode - Cannot Enter?

I know there has been some discussion on this issue and I have Googled the
subject matter, but have not found a solution yet. When I attempt to go
into Standby Mode, I get the message:

The device driver for the "Dell Enhanced Quietkey PS2 with Dell Touch"
device is preventing the machine from entering Standby.

I downloaded and installed the latest driver from the Dell Web Site for the
Keyboard, but the error is still present.

My system configuration is:
Dim 8300 3.0GHz, 1GB Ram, 120GB Serial ATA Harddrive, 3.5 Floppy
Window XP Home, SP2 and all current updates
Dell 1901FP Digital Flat Panel
128MB DDR ATI Radeon 9800
External USB 80GB harddrive
Omega 250 USB Zip Drive
Dell Optical Mouse
Dell Enhanced Quietkey PS2 Keyboard
48X Max CD-RW
9X DVD+R/RW CD-RW
SoundBlaster Live with 5.1 support
Epson 1200U Flat Bed Scanner
HP Laserjet 3100 Printer (Parallel)
HP Officejet d145 Printer (USB)

Anyone with thoughts on how to resolve this problem? I can post more
information if needed. Thanks for any insights and/or tips.
Charlie
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Charliec