Don't run kill_python as part of the build process.  Change the buildbots so they have to call it explicitly instead.
diff --git a/PCbuild/pythoncore.vcproj b/PCbuild/pythoncore.vcproj
index 5e14ef7..9683bd1 100644
--- a/PCbuild/pythoncore.vcproj
+++ b/PCbuild/pythoncore.vcproj
@@ -58,8 +58,8 @@
 			/>
 			<Tool
 				Name="VCPreLinkEventTool"
-				Description="Generate build information and kill existing Python processes..."
-				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release&#x0D;&#x0A;&quot;$(KillPythonExe)&quot;"
+				Description="Generate build information..."
+				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -133,8 +133,8 @@
 			/>
 			<Tool
 				Name="VCPreLinkEventTool"
-				Description="Generate build information and kill existing Python processes..."
-				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release&#x0D;&#x0A;&quot;$(KillPythonExe)&quot;"
+				Description="Generate build information..."
+				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -211,8 +211,8 @@
 			/>
 			<Tool
 				Name="VCPreLinkEventTool"
-				Description="Generate build information and kill existing Python processes..."
-				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Debug&#x0D;&#x0A;&quot;$(KillPythonExe)&quot;"
+				Description="Generate build information..."
+				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Debug"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -289,8 +289,8 @@
 			/>
 			<Tool
 				Name="VCPreLinkEventTool"
-				Description="Generate build information and kill existing Python processes..."
-				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Debug&#x0D;&#x0A;&quot;$(KillPythonExe)&quot;"
+				Description="Generate build information..."
+				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Debug"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -363,8 +363,8 @@
 			/>
 			<Tool
 				Name="VCPreLinkEventTool"
-				Description="Generate build information and kill existing Python processes..."
-				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release&#x0D;&#x0A;&quot;$(KillPythonExe)&quot;"
+				Description="Generate build information..."
+				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -438,8 +438,8 @@
 			/>
 			<Tool
 				Name="VCPreLinkEventTool"
-				Description="Generate build information and kill existing Python processes..."
-				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release&#x0D;&#x0A;&quot;$(KillPythonExe)&quot;"
+				Description="Generate build information..."
+				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -513,8 +513,8 @@
 			/>
 			<Tool
 				Name="VCPreLinkEventTool"
-				Description="Generate build information and kill existing Python processes..."
-				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release&#x0D;&#x0A;&quot;$(KillPythonExe)&quot;"
+				Description="Generate build information..."
+				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release"
 			/>
 			<Tool
 				Name="VCLinkerTool"
@@ -588,8 +588,8 @@
 			/>
 			<Tool
 				Name="VCPreLinkEventTool"
-				Description="Generate build information and kill existing Python processes..."
-				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release&#x0D;&#x0A;&quot;$(KillPythonExe)&quot;"
+				Description="Generate build information..."
+				CommandLine="&quot;$(SolutionDir)make_buildinfo.exe&quot; Release"
 			/>
 			<Tool
 				Name="VCLinkerTool"