I have not noticed a pattern of anything that I have done to cause it.  It seems to be totally random.
When I get the blue screen, the only info that may not be standard is this:
	
		
			
			
				driver_irql_not_less_or_equal
Stop: 0x000000D1 (0xE1F7A7FC, 0X000000FF, 0X00000000, 0XFF6FD9B5)
			
		
 
	 
 Then, after I reboot, a screen will pop up saying that the system has recovered from a serious error.  When I click to view error details, I get this info:
	
		
			
			
				Error Signature:
BCCode : 100000d1     BCP1 : E1F7A7FC     BCP2 : 000000FF     BCP3 : 00000000
BCP4 : FF6FD9B5     OSVer : 5_1_2600     SP : 2_0     Product : 256_1  
C:\DOCUME~1\JESSEN~1\LOCALS~1\Temp\WER631d.dir00\M  ini011606-02.dmp
C:\DOCUME~1\JESSEN~1\LOCALS~1\Temp\WER631d.dir00\s  ysdata.xml
			
		
 
	 
 Thank you very much... any advice would be greatly appriciated! 
~DrJ~