Vista hangs unexpectedly, how to find a cause of hang-up?

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Hi, all.

I installed Windows Vista about three weeks ago. From the very beginning it hangs two or three times a day. I cannot find anything that I can suspect. There is no overclocking, antivirus (KIS) is uninstalled. The only things I see is the records in the reliability and performance monitor: "Disruptive shutdown" in the "Miscellaneous Failures". I'm not doing anything specific before each hangup - working in some program, developing applications, surfing internet or watching a movie. It hangs sometimes when the PC is idle. It looks like CPU is not overheated because settings in the BIOS set to signal about overheating at minimum suspicious temperature - 60C, the CPU temperature rarely goes higher than 50C and almost never hit 55C. What is important it is that in same conditions with same hardware there were no problems under Windows XP. Count of hangups of Windows XP was three..five times a year.

I'd like to know how to detect cause of hang-up? Is there any common practices?

My system is: Windows Vista Ultimate SP1, all latest updates applied.
CPU: Pentium 4, 2.4GHz, hyper-threading mode enabled
RAM: 2Gb
HDD:
1. QUANTUM FIREBALLlct20 20 ATA Device
2. ST3120026A ATA Device
3. ST380011A ATA Device

Audio: Realtek AC'97 Audio
CD/DVD-RW: _NEC DVD_RW ND-3520A ATA Device
Video: ATI Radeon HD 2600 PRO from GeCube
Network: Realtek RTL8139/810x Family Fast Ethernet

Bluetooth adapter, Ready Boost flash installed, Rainbow iKey 1000, Microsoft Wireless Mouse IntellExplorer 4.0, Microsoft Natural Keyboard Pro

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