Delete CurrentVersion instead of setting it.
diff --git a/PCbuild/python15.wse b/PCbuild/python15.wse
index bc45a19..d7adc28 100644
--- a/PCbuild/python15.wse
+++ b/PCbuild/python15.wse
@@ -70,10 +70,6 @@
   Value=1.5

 end

 item: Set Variable

-  Variable=PY_FULLVERSION

-  Value=1.5.2

-end

-item: Set Variable

   Variable=MAINDIR

   Value=Python

 end

@@ -983,8 +979,7 @@
 end

 item: Edit Registry

   Key=Software\Python\PythonCore\CurrentVersion

-  New Value=%PY_FULLVERSION%

-  Root=2

+  Root=130

 end

 item: Edit Registry

   Key=Software\Python\PythonCore\%PY_VERSION%\InstallPath