Malware

To change the recovery settings to disable automatic rebooting:

1.Right-click My Computer, and then click Properties.

2.Click the Advanced tab.

3.Under Startup and Recovery, click Settings to open the Startup and Recovery dialog box.

4.Clear the Automatically restart check box, and click OK the necessary number of times.

5.Restart your computer for the settings to take effect.

Note the stop error message and post in a reply.

It's likely driver related. An analysis of minidump(s) will usually pinpoint the cause.

Minidump Files can be found here. C:\WINDOWS\Minidump\Mini******-**.dmp
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How to read the small memory dump files that Windows creates for debugging
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http://support.microsoft.com/kb/315263
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To download and install the Windows debugging tools, visit the following Microsoft Web site:
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http://www.microsoft.com/whdc/devtools/debugging/default.mspx
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Instructions on using Windbg.
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Open Windbg and select file, Symbol file path and brows to the Symbol folder that you have downloaded and installed Symbols to, select OK.
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Close the workpage and save the Workspace information. This should lock in the Symbol path.
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Open Windbg and select file and select Open Crash Dump then navigate to the minidump, highlight it and select Open.
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There are two ways to use !analyze -v the easiest is to click on !analyze -v under Bugcheck Analysis.
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When you have ran the initial dump if you look to the bottom of the screen you will see kd> to the right of that type in !analyze -v and press the Enter key.
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Ctrl + a will let you copy the information and paste it into notepad.
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Look to the bottom of the page for information like this. This was fixed by updating the Graphics Drivers.
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FAULTING_THREA 864f6a98
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DEFAULT_BUCKET_I GRAPHICS_DRIVER_FAULT
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CUSTOMER_CRASH_COUNT: 1
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BUGCHECK_STR: 0xEA
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PROCESS_NAME: logon.scr
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LAST_CONTROL_TRANSFER: from 00000000 to bfef0fea
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STACK_TEXT: f6434e6c 00000000 00000000 00000000 00000000 sgiul50!DrvBitBlt+0x585
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STACK_COMMAN .thread 0xffffffff864f6a98 ; kb
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FOLLOWUP_IP: sgiul50!DrvBitBlt+585 bfef0fea 75f9 jne sgiul50!DrvBitBlt+0x580 (bfef0fe5)
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SYMBOL_STACK_INDEX: 0
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SYMBOL_NAME: sgiul50!DrvBitBlt+585
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FOLLOWUP_NAME: MachineOwner
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MODULE_NAME: sgiul50
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IMAGE_NAME: sgiul50.dll
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DEBUG_FLR_IMAGE_TIMESTAMP: 3b7dfec7
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FAILURE_BUCKET_I 0xEA_IMAGE_sgiul50.dll_DATE_2001_08_18
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BUCKET_I 0xEA_IMAGE_sgiul50.dll_DATE_2001_08_18

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<i>Keep us informed as to your progress if you require further assistance.</i>
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</i>

Does your computer reboot when you are in SAFE MODE? You said you've done a few things in safe mode, so I'm assuming it doesn't reboot in safe mode.

If that is the case, then something that is starting up with Windows is causing it to hang and reboot.

Have you run MSCONFIG and checked out the [startup] tab to see what is starting up? What you can try is to DISABLE THEM ALL, reboot then see what happens.

Let us know.