diogenysos: A common problem with mobos with Nvidia chipset.

Reboot wiill have no effect as it does not reload the drivers.

You can try
A. Switch and UNPLUG computer from power for about 5 mins. Restart.

If that does not improve then try the MS temporary fix is:
B. From the command prompt run as administrator
1) Type "bcdedit /set truncatememory 0x80000000" (no quotes)
2) Reboot
3) Go to control panel -> System and Security -> view amount of RAM and processor speed.
- It should report 4GB (2GB available)


To undo this temp fix (when MS issue a patch), open the command prompt again:
1) Type "bcdedit /deletevalue truncatememory" (no quotes)
2) Reboot
3) Go to control panel -> System and Security -> view amount of RAM and processor speed.
- It should report 4GB

Hope this helps.