I recently downloaded and installed the colemak windows binary, and it worked fine for several days.  Then I had to restart, and when it finished rebooting, I couldn't login to my account anymore.  The screen would just go black and then log me back out.  This happened even in safe mode.  Other accounts could still log in.  It had been a long time since I installed the colemak layout, so I didn't suspect it, but thankfully I thought to check the event log.  I saw that winlogon.exe was having problems starting, and the debugging information mentioned colemak2.dll.  I deleted the two dlls with that name and suddenly everything was working again.

So it seems there may be some kind of bug with Windows 7.  I have attached some event log data in case it helps.

Log Name:      Application
Source:        Application Error
Date:          3/13/2013 8:16:48 PM
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      ...
Description:
Faulting application name: winlogon.exe, version: 6.1.7601.17514, time stamp: 0x4ce79fa6
Faulting module name: Colemak2.dll, version: 1.0.3.40, time stamp: 0x45fdd522
Exception code: 0xc0000005
Fault offset: 0x0000000000003df8
Faulting process id: 0x113c
Faulting application start time: 0x01ce206258c810ae
Faulting application path: C:\Windows\system32\winlogon.exe
Faulting module path: C:\Windows\system32\Colemak2.dll
Report Id: 9abac95c-8c55-11e2-893d-005056c00008