Blue Screen Error on Windows 7

I have encountered a problem with my Windows 7 (Built 7000) for the last 2 months since I installed it. The blue screen error keeps popping up from time to time (usually not quite often 2-3 times a month, but twice today). The problem seems to come from Kernel-Power, which is according to the report. Here is the complete report:

The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.

-

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] 2009-03-25T13:05:50.404419200Z

EventRecordID 32354

Correlation

- Execution [ ProcessID] 4 [ ThreadID] 8

Channel System

Computer KaMaL-BenQ

- Security [ UserID] S-1-5-18

-

EventData

BugcheckCode

142

BugcheckParameter

0xc0000005

BugcheckParameter

0x8252877d

BugcheckParameter

0x9d983bec

BugcheckParameter

0x0

SleepInProgress

false

PowerButtonTimestamp

0

Please tell me what to do to fix this problem as I am afraid that it will damage my other hardware from unexpected shutdown.

Ps. I have installed a RAM to my laptop a couple of days after running on Windows 7 (there are currently  2 installed, same BUS and manufacturer - Kingston).

I just run memory check (from Windows Control Panel) and not error has been detected.

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