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Many buildbots are failing with this error:
"""
======================================================================
ERROR: idlelib.idle_test.test_warning (unittest.loader.ModuleImportFailure)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "E:\Data\buildslave\cpython3円.x.snakebite-win2k3r2sp2-x86\build\lib\unittest\case.py", line 57, in testPartExecutor
 yield
 File "E:\Data\buildslave\cpython3円.x.snakebite-win2k3r2sp2-x86\build\lib\unittest\case.py", line 574, in run
 testMethod()
 File "E:\Data\buildslave\cpython3円.x.snakebite-win2k3r2sp2-x86\build\lib\unittest\loader.py", line 32, in testFailure
 raise exception
ImportError: Failed to import test module: idlelib.idle_test.test_warning
Traceback (most recent call last):
 File "E:\Data\buildslave\cpython3円.x.snakebite-win2k3r2sp2-x86\build\lib\unittest\loader.py", line 312, in _find_tests
 module = self._get_module_from_name(name)
 File "E:\Data\buildslave\cpython3円.x.snakebite-win2k3r2sp2-x86\build\lib\unittest\loader.py", line 290, in _get_module_from_name
 __import__(name)
 File "E:\Data\buildslave\cpython3円.x.snakebite-win2k3r2sp2-x86\build\lib\idlelib\idle_test\test_warning.py", line 19, in <module>
 from idlelib import run
 File "E:\Data\buildslave\cpython3円.x.snakebite-win2k3r2sp2-x86\build\lib\idlelib\run.py", line 58, in <module>
 tcl = tkinter.Tcl()
 File "E:\Data\buildslave\cpython3円.x.snakebite-win2k3r2sp2-x86\build\lib\tkinter\__init__.py", line 1901, in Tcl
 return Tk(screenName, baseName, className, useTk)
 File "E:\Data\buildslave\cpython3円.x.snakebite-win2k3r2sp2-x86\build\lib\tkinter\__init__.py", line 1805, in __init__
 self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: Can't find a usable init.tcl in the following directories: 
 E:/Data/buildslave/cpython/3.x.snakebite-win2k3r2sp2-x86/build/lib/tcl8.6 E:/Data/buildslave/cpython/3.x.snakebite-win2k3r2sp2-x86/build/lib/tcl8.6 E:/Data/buildslave/cpython/3.x.snakebite-win2k3r2sp2-x86/lib/tcl8.6 E:/Data/buildslave/cpython/3.x.snakebite-win2k3r2sp2-x86/build/library E:/Data/buildslave/cpython/3.x.snakebite-win2k3r2sp2-x86/library E:/Data/buildslave/cpython/3.x.snakebite-win2k3r2sp2-x86/tcl8.6.1/library E:/Data/buildslave/cpython/tcl8.6.1/library
This probably means that Tcl wasn't installed properly.
"""
See e.g. http://buildbot.python.org/all/builders/x86%20Windows%20Server%202003%20%5BSB%5D%203.x/builds/2274/steps/test/logs/stdio 

It's probably a regression of the changeset c2e2dc6c8769b6f37638149a9e9d0aad5845b3f1:
"Issue #15968: Incorporated Tcl, Tk, and Tix builds into the Windows build solution. "

Indeed, although honestly I can't figure out exactly why. However, #20035 should fix the failures; I haven't committed it because the patch is in C and I can't guarantee that I haven't missed anything big. If either of you (or anyone else at all :-) could review that patch for me, I would be very grateful.

New changeset c507da0b573f by Zachary Ware in branch 'default':
Issue #21059: Temporary measure to make the Windows buildbots useful again.
http://hg.python.org/cpython/rev/c507da0b573f 

I believe I eventually figured out the reason for the failure, it had to do with the fact that the Tcl/Tk DLLs were copied into PCbuild to avoid adding ..\tcltk[64]\bin to PATH and the persistent issue that tkinter._fix changes environment variables to make init.tcl findable, while regrtest unsets those variables at the end of each test. The issue is successfully worked around in test[-amd64].bat, and should be fixed by #20035 (once reviewed :)).
Closing this issue.