diff --git a/README.md b/README.md
index 8a05822..880c1df 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ The required Qt DLLs as well as the encoder binaries are *included* with the app
 
 The minimum system requirements to run Simple x264/x265 Launcher are as follows:
 
-* Windows XP with Service Pack 2 or any later Windows system – note that Windows XP is **not** recommended!
+* Windows Vista with Service Pack 2 or any later Windows system – note that Windows XP is **not** supported anymore!
 * 64-Bit editions of Windows are highly recommended, though 32-Bit editions will work as well
 * The CPU must support at least the MMX and SSE instruction sets
 * Avisynth input only available with [Avisynth](http://avisynth.nl/index.php/Main_Page#Official_builds) **2.6** installed – Avisynth **2.5.x** is *not* recommended!
diff --git a/etc/setup/setup.nsi b/etc/setup/setup.nsi
index e1d82c9..8b41c39 100644
--- a/etc/setup/setup.nsi
+++ b/etc/setup/setup.nsi
@@ -317,35 +317,21 @@ Function .onInit
 		Quit
 	${EndIf}
 
-	# Running on Windows XP or later?
-	${If} ${AtMostWin2000}
-		MessageBox MB_TOPMOST|MB_ICONSTOP "Sorry, but your operating system is *not* supported anymore.$\nInstallation will be aborted!$\n$\nThe minimum required platform is Windows XP (Service Pack 3)."
+	# Running on Windows Vista or later?
+	${If} ${AtMostWinXP}
+		MessageBox MB_TOPMOST|MB_ICONSTOP "Sorry, but your operating system is *not* supported anymore.$\nInstallation will be aborted!$\n$\nThe minimum supported platform is Windows Vista (Service Pack 2)."
 		ExecShell "open" "http://windows.microsoft.com/"
 		Quit
 	${EndIf}
 
-	# If on Windows XP, is the required Service Pack installed?
-	${If} ${IsWinXP}
-		${IfNot} ${RunningX64} # Windows XP 32-Bit, requires Service Pack 3
-		${AndIf} ${AtMostServicePack} 2
-			MessageBox MB_TOPMOST|MB_ICONEXCLAMATION "This application requires Windows XP with Service Pack 3 installed.$\nWindows XP *without* Service Pack 3 reached end-of-life on 2010-07-13.$\nCurrent Windows XP (Service Pack 3) will be supported until 2014-04-08.$\n$\nPlease install Service Pack 3 now or just run Windows Update!"
-			${If} ${Cmd} `MessageBox MB_TOPMOST|MB_ICONQUESTION|MB_YESNO "Do you want to download Service Pack 3 for Windows XP now?" IDYES`
-				ExecShell "open" "http://www.microsoft.com/en-us/download/details.aspx?id=24"
-			${Else}
-				ExecShell "open" "http://windowsupdate.microsoft.com/"
-			${EndIf}
-			Quit
-		${EndIf}
-		${If} ${RunningX64} # Windows XP 64-Bit, requires Service Pack 2
-		${AndIf} ${AtMostServicePack} 1
-			MessageBox MB_TOPMOST|MB_ICONEXCLAMATION "This application requires Windows XP x64 Edition with Service Pack 2 installed.$\nWindows XP x64 Edition *without* Service Pack 2 reached end-of-life on 2009-04-14.$\nCurrent Windows XP x64 Edition (Service Pack 2) will be supported until 2014-04-08.$\n$\nPlease install Service Pack 2 now or just run Windows Update!"
-			${If} ${Cmd} `MessageBox MB_TOPMOST|MB_ICONQUESTION|MB_YESNO "Do you want to download Service Pack 2 for Windows XP x64 Edition now?" IDYES`
-				ExecShell "open" "http://www.microsoft.com/en-us/download/details.aspx?id=17791"
-			${Else}
-				ExecShell "open" "http://windowsupdate.microsoft.com/"
-			${EndIf}
-			Quit
+	# If on Windows Vista, is the required Service Pack installed?
+	${If} ${IsWinVista}
+	${AndIf} ${AtMostServicePack} 1
+		MessageBox MB_TOPMOST|MB_ICONEXCLAMATION "This application requires Windows Vista with Service Pack 2 installed."
+		${If} ${Cmd} `MessageBox MB_TOPMOST|MB_ICONQUESTION|MB_YESNO "Do you want to download Service Pack 2 for Windows Vista now?" IDYES`
+			ExecShell "open" "https://www.microsoft.com/en-us/download/details.aspx?id=16468"
 		${EndIf}
+		Quit
 	${EndIf}
 
 	; --------