The same is happening with Vista Ultimate. This started immediately after the MSN Hotmail update. Not been able to find a fix yet but...
Faulting application Explorer.EXE, version 6.0.6001.18000, time stamp 0x47918e5d, faulting module SHELL32.dll, version 6.0.6001.18000, time stamp 0x4791a73f, exception code 0xc0000005, fault offset 0x00152601, process id 0x1a30, application start time 0x01c89d98989a2c35
Event log...
Regards