diff --git a/cmake/install/windows/NSIS.template.in b/cmake/install/windows/NSIS.template.in
index f22622477..5b53baa60 100644
--- a/cmake/install/windows/NSIS.template.in
+++ b/cmake/install/windows/NSIS.template.in
@@ -291,6 +291,27 @@ Function AddToPath
     Pop $0
 FunctionEnd
 
+Function checkRunning
+	retry:
+	ClearErrors
+	ExecWait '"cmd" /C ""%SystemRoot%\System32\tasklist" /NH /FI "IMAGENAME eq @CPACK_NSIS_MUI_FINISHPAGE_RUN@" | "%SystemRoot%\System32\find" /I /C "@CPACK_NSIS_MUI_FINISHPAGE_RUN@""' $0
+	IntCmp $0 1 notRunning
+	MessageBox MB_RETRYCANCEL|MB_ICONEXCLAMATION "@CPACK_NSIS_MUI_FINISHPAGE_RUN@ is running. Please close it first from the application menu and restart the installation." /SD IDCANCEL IDRETRY retry
+	Abort
+	notRunning:
+FunctionEnd
+
+;Duplicate function because of shitty behavior of NSIS that need "un." form for uninstaller.
+Function un.checkRunning
+	retry:
+	ClearErrors
+	ExecWait '"cmd" /C ""%SystemRoot%\System32\tasklist" /NH /FI "IMAGENAME eq @CPACK_NSIS_MUI_FINISHPAGE_RUN@" | "%SystemRoot%\System32\find" /I /C "@CPACK_NSIS_MUI_FINISHPAGE_RUN@""' $0
+	IntCmp $0 1 notRunning
+	MessageBox MB_RETRYCANCEL|MB_ICONEXCLAMATION "@CPACK_NSIS_MUI_FINISHPAGE_RUN@ is running. Please close it first from the application menu and restart the installation." /SD IDCANCEL IDRETRY retry
+	Abort
+	notRunning:
+FunctionEnd
+
 
 ; RemoveFromPath - Remove a given dir from the path
 ;     Input: head of the stack
@@ -801,7 +822,9 @@ FunctionEnd
 ;--------------------------------
 ; determine admin versus local install
 Function un.onInit
-
+  
+  Call un.checkRunning
+	
   ClearErrors
   UserInfo::GetName
   IfErrors noLM
@@ -963,13 +986,10 @@ SectionEnd
 ; "Program Files" for AllUsers, "My Documents" for JustMe...
 
 
+
+
 Function .onInit
-  retry:
-  ClearErrors
-  ExecWait '"cmd" /C ""%SystemRoot%\System32\tasklist" /NH /FI "IMAGENAME eq @CPACK_NSIS_MUI_FINISHPAGE_RUN@" | "%SystemRoot%\System32\find" /I /C "@CPACK_NSIS_MUI_FINISHPAGE_RUN@""' $0
-  IntCmp $0 1 notRunning
-  MessageBox MB_RETRYCANCEL|MB_ICONEXCLAMATION "@CPACK_NSIS_MUI_FINISHPAGE_RUN@ is running. Please close it first from the application menu and restart the installation." /SD IDCANCEL IDRETRY retry
-  Abort
+  Call checkRunning
 
 notRunning: