Use 'del' instead of rmpyc.py to remove the pyc and pyo files.
diff --git a/Tools/buildbot/clean.bat b/Tools/buildbot/clean.bat
index 19400a9..df50aff 100644
--- a/Tools/buildbot/clean.bat
+++ b/Tools/buildbot/clean.bat
@@ -2,6 +2,6 @@
 call "%VS71COMNTOOLS%vsvars32.bat"
 cd PCbuild
 @echo Deleting .pyc/.pyo files ...
-python_d.exe rmpyc.py
+del /s Lib\*.pyc Lib\*.pyo
 devenv.com /clean Release pcbuild.sln
 devenv.com /clean Debug pcbuild.sln