Vista - Blue Screen Error

Hi: I run Vista Home Premium on an HP laptop. A few weeks ago, I frequently
began getting blue screens of death when shutting down. This seemed to link
to a USB device (the error message stated USB devices not recognized).

All of my drivers are up to date.

Checking device manager, my Ipod was identified as having
problems, even though it was up to date, as was Itunes. My solution was to
simply unplug my Itunes.

Nevertheless, these problems continue, and I have also received the error
message irq_not_not_less_or_equal (whcih I got this morning). I have copied
the latest problem details below.

I have no idea what to do. Any ideas?

Thanks,

Richard

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 4105

Additional information about the problem:
BCCode: fe
BCP1: 00000006
BCP2: 88572DD0
BCP3: 48766544
BCP4: 00000000
OS Version: 6_0_6000
Service Pack: 0_0
Product: 768_1

Files that help describe the problem:
C:\WINDOWS\Minidump\Mini121607-01.dmp
C:\Users\Richard\AppData\Local\Temp\WER-88826-0.sysdata.xml
C:\Users\Richard\AppData\Local\Temp\WERD6ED.tmp.version.txt