MS: Insufficient System Resources Exist to Complete the API Error

The computer occasionally does not hibernate and you receive an "Insufficient System Resources Exist to Complete the API" error message in Windows XP with Service Pack 2, in Windows XP Tablet PC Edition 2005, or in Windows XP Media Center Edition 2005

When you experience this problem, the hibernate feature is not available on the computer until you restart the computer.

This problem typically occurs when the computer uses 1 gigabyte (GB) or more of RAM.

http://support.microsoft.com/kb/909095