error 77 Kernal stack inpage error

when I was performing on line malware scanning, my system crashed
with the following error:
ERROR 77
KERNEL_STACK_INPAGE_ERROR
In the brackets below all numbers were 0 except the last one that read
78D7000.
What does this error indicate and how to fix it that the system does not
crash. This is the first time I saw this error message though the system has
crashed several times with different errors.
My system details:
Dell inspiron 531
Windows Vista Home premium 32bt SP2
Ram=4 Gb
Video= nvidia geforce 6150 nforce
Security= Norton Internet Security 2010.

I appreciate any help.

Best Regards
Noor Motani

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Best Regards
Noor Motani