IRQL_NOT_LESS_OR_EQUAL BSOD After Recovering From Sleep Mode

My Windows Vista displays a blue screen with the message "IRQL_NOT_LESS_OR_EQUAL" when I attempt to recover from sleep mode. I am unsure what the problem is and I am in need of help. I have not changed anything vital on my system including the current locale and this problem is very recent.

Some Information:
Bit: x64
OS: Windows Vista Home Premium (Pre-Installed)
Age of System: About 5 years in age.
Age of OS Installation: About 5 years in age. (Never re-installed)

Information from the Windows Error Window:
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6001.2.1.0.768.3
Locale ID: 1041

Additional information about the problem:
BCCode: d1
BCP1: FFFFFA60041D0017
BCP2: 0000000000000002
BCP3: 0000000000000008
BCP4: FFFFFA60041D0017
OS Version: 6_0_6001
Service Pack: 1_0
Product: 768_1

Thank you for your time.

Does this problem occur if you do a normal boot from shutdown?

If not, if you go to Device Manager, are there any problems indicated?

Try installing service pack 2.