tell em the upgrade was done at a puter shop and they should be ok
anyway as for the stop error, go into folder options, under the view tab. and tick the box to 'launch folder windows in a seperate process'.
"MORE INFORMATION
Stop error 0x0000000A (Stop 0x0A) shows that there was an attempt in kernel mode to touch pageable memory at too high a process internal request level (IRQL). This error usually occurs when a driver uses an incorrect memory address. Other possible causes of this error are an incompatible device driver, a general hardware problem, and incompatible software. "
anyway, being as though u updated to XP, i would head over to the dell support site and get any xp drivers they have on offer, dell are fookers for using hardware thats like 2% diffrent than the normal OEM/Retail version, so if XP has installed default drivers for say a turtle beach santa cruz soundcard. (aint gunna happen with that card, just as refrence) and in reality its a dell version of the card, the makers drivers would cause BSOD, but the dell official release should fix the problem.
thats the problem with dell, bulk buying parts with there own name stamped onto them, Dell are great out the box, but complete bastords when an upgrade is needed.