I actually realized, I have a classic BSOD on a system that was sitting for a year and now I am refiring up. It is sporadic, can happen after some hours of usage.
driver_irql_not_less_or_equal is the most common message and
usbehci.sys was the driver when it just happenned
There may be some variation, but I think that is the usual message.
Turns out this is rather common and I remember when I searched for this I found about 5-10 totally different discussions and ideas, with little solid. This is on a PowerSpec that had been well-behaved for a couple years before this happened. I did some searching this AM and all sorts of ideas came up.
So I may do the Windows Update route to SP3, delete/rename the driver and replace (after searching for another copy), take out the USB backup when not in use, check the driver updates, add memory if I have it handy (which I think I planned anyway), and do a few other things .. and then format and reinstall XP if nothing works (I may I have a disk, and PowerSpec gives reasonable overview discussion support even if warranty is finito in my experience). It is a nice little system otherwise.
Hmm.. if I do a OS (XP) reinstall (which I have done on various systems maybe twice) -- it would be nice to have the procedures in order ahead of time. Things like saving the Sysinfo and serial#, having a Bart-PE type of disk, give Microsoft a call about verification issues and read the articles about saving that, driver backups, checking ahead for the XP disk (if not, use another ?). Of course this varies a lot between systems (how they vary with their CDs and their hidden partitions and this and that). Wonder if we have a thread on that stuff.