Problem BLUE SCREEN ERROR NEED HELP!!!! (FOR THE PROS)

hi i have recently purchased an emachine 4220 with home premium installed its
driving me mad i have been tryin to establish what the error is for three
weeks now and am reasonably sure its not a hardware issue as i have ran
memtest etc and nothing has come up i believe that it is a software issue but
i need some computer guru to verify this the information is below:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 2057

Additional information about the problem:
BCCode: 50
BCP1: F1702140
BCP2: 00000001
BCP3: 81CE7610
BCP4: 00000002
OS Version: 6_0_6000
Service Pack: 0_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini122907-02.dmp
C:\Users\Simon\AppData\Local\Temp\WER-37986-0.sysdata.xml
C:\Users\Simon\AppData\Local\Temp\WERAEE4.tmp.vers ion.txt

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if anyone can solve this i will be forever in your debt

this will be a tough one as i am an expert in computing so if anyone can
solve it they will prove their expertiese thanks for you time im online
tomorrow so i look forward to a quick reply

p.s i have downloaded all additional updates from microsoft and have all the
latest drivers from my manufacturer, if your require a dump file i will
upload please provide instructions and i look forward to your reply.