Bluescreen

I am not sure if this is the section to post this topic but here i go. After a lot of thinking i finally decided to upgrade my whole pc even motherboard something which i havent done. With the suggestions of many people here stating now a days its quite easy to get it up and running and it was. The only thing is im running into an annoying blue screen something which i never had on xp. When i boot up my pc it goes all the way to the log in screen and when im going to type the password i get the blue screen. When it reboots back the log in screen it lets me log in and everything is back to normal which is odd it does it on first start ups heres the message it gave me.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1033

Additional information about the problem:
BCCode: 50
BCP1: FFFFF3000BC2B420
BCP2: 0000000000000000
BCP3: FFFFF880019371F0
BCP4: 0000000000000007
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\120410-24304-01.dmp
C:\Users\Squallheart\AppData\Local\Temp\WER-43212-0.sysdata.xml

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check RAM with software memtest 86+ if no error, go bios select default from factory / Clear Cmos