Shortened the description for Clean install

src/main/external-resources/nsis/setup.nsi

@@ -111,7 +111,7 @@ Function AdvancedSettings
 	${NSD_CreateText} 3% 30% 10% 12u "768"
 	Pop $Text
 
-	${NSD_CreateLabel} 0 50% 100% 20u "This replaces your current configuration files with new ones and deletes some cache files, allowing you to take advantage of improved defaults. This will delete all files in the UMS configuration directory."
+	${NSD_CreateLabel} 0 50% 100% 20u "This replaces your current configuration and deletes MPlayer's font cache, allowing you to take advantage of improved defaults. This deletes UMS configuration directory."
 	Pop $DescCleanInstall
 
 	${NSD_CreateCheckbox} 3% 65% 100% 12u "Clean install"