XP Home Edition Driver error?

I have XP Home edition on one of my PCs (SOYO Motherboard with AMD
processor, 500 M mem). I am running into 2 issues. (1)It keeps rebooting
itslef without any warnings and (2) some times I get error message when
I start the machine. Below are details of the error message:
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C:\WINDOWS\Minidump\Mini071304-01.dmp
C:\DOCUME~1\Name\LOCALS~1\Temp\WER21.tmp.dir00\sys data.xml

BCCode : 1000008e BCP1 : C0000005 BCP2 : BF8F43CE BCP3 :
F6EFB878

BCP4 : 00000000 OSVer : 5_1_2600 SP : 1_0 Product : 768_1
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It says the error was caused by a device driver but does not tell me
which device driver.
I am not sure if both of these are linked (rebooting and error message)
because when I get an error message it does not cause it to reboot
necessarily.
How can I find out why it reboots and why it gives me the error message?
How can I get rid of it?
Thank you for your help