diff --git a/Web2Exe.nsi b/Web2Exe.nsi
index 24491cc..bde4832 100644
--- a/Web2Exe.nsi
+++ b/Web2Exe.nsi
@@ -78,8 +78,12 @@ Section "Web2Executable" SEC01
   SectionIn RO
   SetOutPath "$INSTDIR"
   SetOverwrite try
-  File /r "Web2ExeWin\"
+  File /r /x compressors "Web2ExeWin\"
   
+  CreateDirectory "$LocalAppData\Web2Executable\Web2Executable\files\compressors"
+  SetOutPath "$LocalAppData\Web2Executable\Web2Executable\files\compressors"
+  File "Web2ExeWin\files\compressors\upx-win.exe"
+
   ; Shortcuts
   !insertmacro MUI_STARTMENU_WRITE_BEGIN Application
   CreateDirectory "$SMPROGRAMS\$ICONS_GROUP"
diff --git a/command_line.py b/command_line.py
index 60e6ab0..7bea3a3 100644
--- a/command_line.py
+++ b/command_line.py
@@ -65,6 +65,10 @@ def get_file(path):
     independent_path = utils.path_join(CWD, *parts)
     return independent_path
 
+def is_installed():
+    uninst = get_file('uninst.exe')
+    return utils.is_windows() and os.path.exists(uninst)
+
 __version__ = "v0.0.0"
 
 with open(get_file('files/version.txt')) as f:
@@ -842,6 +846,7 @@ def compress_nw(self, nw_path):
         compression = self.get_setting('nw_compression_level')
         if compression.value == 0:
             return
+
         comp_dict = {'Darwin64bit': get_file('files/compressors/upx-mac'),
                      'Darwin32bit': get_file('files/compressors/upx-mac'),
                      'Linux64bit':  get_file('files/compressors/upx-linux-x64'),
@@ -850,6 +855,10 @@ def compress_nw(self, nw_path):
                      'Windows32bit':  get_file('files/compressors/upx-win.exe')
                      }
 
+        if is_installed():
+            comp_dict['Windows64bit'] = get_data_file_path('files/compressors/upx-win.exe')
+            comp_dict['Windows32bit'] = get_data_file_path('files/compressors/upx-win.exe')
+
         plat = platform.system()+platform.architecture()[0]
         upx_version = comp_dict.get(plat, None)