Okay, first Good evening!
I had enough of crashes and freezings. I recently bought a new GTX 650 Ti (2GB) card and
since then I started having troubles.
Here's the log:
Kernel-Power (Event ID:41)

- System

- Provider

[ Name] Microsoft-Windows-Kernel-Power
[ Guid] {331C3B3A-2005-44C2-AC5E-77220C37D6B4}

EventID 41

Version 2

Level 1

Task 63

Opcode 0

Keywords 0x8000000000000002

- TimeCreated

[ SystemTime] 2012-11-27T20:22:25.796875000Z

EventRecordID 11082

Correlation

- Execution

[ ProcessID] 4
[ ThreadID] 8

Channel System

Computer Ciel-PC

- Security

[ UserID] S-1-5-18


- EventData

BugcheckCode 0
BugcheckParameter1 0x0
BugcheckParameter2 0x0
BugcheckParameter3 0x0
BugcheckParameter4 0x0
SleepInProgress false
PowerButtonTimestamp 0

And here's the second Event I usually get:
Kernel-Processor-Power (Event ID:6)

- System

- Provider

[ Name] Microsoft-Windows-Kernel-Processor-Power
[ Guid] {0F67E49F-FE51-4E9F-B490-6F2948CC6027}

EventID 6

Version 0

Level 2

Task 6

Opcode 0

Keywords 0x8000000000000000

- TimeCreated

[ SystemTime] 2012-11-27T22:41:31.281250000Z

EventRecordID 11727

Correlation

- Execution

[ ProcessID] 4
[ ThreadID] 52

Channel System

Computer Ciel-PC

- Security

[ UserID] S-1-5-18


EventData

I really HOPE that someone could help me. Thanks.