I not only can’t say logged in, I can’t stop rebooting:
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033
Additional information about the problem:
BCCode: 50
BCP1: FFFFFFFFFFFFFFD0
BCP2: 0000000000000001
BCP3: FFFFF800034710F1
BCP4: 0000000000000000
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1
Files that help describe the problem:
C:\Windows\Minidump\033015-57096-01.dmp
And this helps me how?
You might try forcing the computer to boot into "Safe Mode" in which most drivers are not loaded, and you may be able to regain control that way. Your OS Version indicates it's Windows 7, which is generally quite stable, so I would try Safe Mode first (unless you already have).
Some other FReepers may have additional suggestions for debugging this.