I have an odd error that doesn't seem to fit in with any of the other odd Windows 7 x64 USB errors that have been kicked up on Google. Here we go:

1. Uninstalled Tortoise SVN and clicked restart computer. My machine had been up for around 28 days
2. On reboot my mouse and keyboard failed to work anymore, couldn't log in. Tried every USB port I have on my Dell 390 and the ports on my Dell 19's, nothing worked. They had power but Windows would not respond when I manipulated the keyboard/mouse.
3. Rebooted my computer and pressed F2 to get into bios, my keyboard is working fine in bios. Keyboard and mouse work fine on other computers when using USB.
4. Found adapters for keyboard and mouse to convert from USB to PS/2 ports, works fine. I'm actually typing this question on the same keyboard, same computer, just using PS/2 ports for my mouse and keyboard.

It appears to be a Windows 7 x64 issue. Other things I have tried:

1. Multiple other mice and keyboards, iphone, all with no luck. Each one gets power, but Windows never tries to install drivers or sees that they are connected.
2. Uninstall and reinstall all USB drivers. Drives uninstall and reinstall fine and report no errors in Control Panel.
3. In Power Management I disallow Windows from turning off USB ports to save power
4. Installed the latest nVidia drivers for my graphics card, no change.

Anyplace else I can look/try? Thanks!