I am working on a computer for a friend who is having an intermittent problem. Periodically during use, the system will crash to a black screen requiring a reboot. The event viewer then shows these two entries which I believe relate to the error: Error code 00000019, parameter1 00000020, parameter2 85438280, parameter3 85438368, parameter4 0a1d0009. The computer has rebooted from a bugcheck. The bugcheck was: 0x00000019 (0x00000020, 0x85438280, 0x85438368, 0x0a1d0009). A dump was saved in: C:\WINDOWS\Minidump\Mini062207-01.dmp. Here are some specs: AMD Athlon 3200+ 512MB RAM 160GB Hard Drive MSI MS-6734 Motherboard Windows XP Home w/SP2 When I first worked on the unit the power supply was defective so I replaced it. I then checked the hard drive and memory and they tested fine. I checked for viruses and spyware with no serious problems found. I reinstalled the video driver, chipset driver, and sound driver as well. As an example, the problem happened when I tried to run a registry cleanup using CCleaner. When I ran it in Safe Mode, however, it worked fine. This is why I believe it's a software/driver issue, but I'm running out of ideas. I have attached the dump file with a .txt instead of .dmp.