sometimes it happens to me (when im talking to someone important on msn and racing). It's rare, but there are times that it takes almost 20 seconds to switch between windows and lfs... same resolution and refresh rate.
                
            



Problem signature:
  Problem Event Name:	APPCRASH
  Application Name:	LFS.exe
  Application Version:	0.0.0.0
  Application Timestamp:	4958fd75
  Fault Module Name:	atiumdag.dll
  Fault Module Version:	7.14.10.636
  Fault Module Timestamp:	496d6d9d
  Exception Code:	c0000005
  Exception Offset:	0004ad03
  OS Version:	6.0.6001.2.1.0.768.3
  Locale ID:	2057
  Additional Information 1:	64ea
  Additional Information 2:	cce9f653dd0f8eec446de52154d2f82d
  Additional Information 3:	8dc8
  Additional Information 4:	0a5bb3b56cc694b98e1f4a3a36903eec