Try to catter for exception in corner cases with some version of windows

Vista. I do a version check on the version of windows (not easy,
actually), and give up on implementing killable processes if the OS is
to recent.

IPython/frontend/_process/killableprocess.py

@@ -50,7 +50,6 b' import subprocess'
 from subprocess import PIPE
 import sys
 import os
-import time
 import types
 
 try:
@@ -69,15 +68,30 b' except ImportError:'
 
 mswindows = (sys.platform == "win32")
 
+skip = False
+
 if mswindows:
+    # Some versions of windows, in some strange corner cases, give
+    # errror with the killableprocess.
+    if sys.version_info[:2] > (2, 4):
+        import platform
+        if platform.uname()[3] == '' or platform.uname()[3] > '6.0.6000':
+            skip = True
+        else:
     import winprocess
 else:
+        skip = True
+else:
     import signal
 
 if not mswindows:
     def DoNothing(*args):
         pass
 
+
+if skip:
+ Popen = subprocess.Popen
+else:
 class Popen(subprocess.Popen):
     if not mswindows:
         # Override __init__ to set a preexec_fn