--- a/ui/mainwindow.cpp	Tue Jul 15 16:30:55 2014 +0200
+++ b/ui/mainwindow.cpp	Tue Jul 15 16:31:24 2014 +0200
@@ -297,15 +297,30 @@
     }
 #else /* WIN32 */
     QStringList parameters;
-    parameters << "/S" << "/UPDATE=1"
-               << QString::fromLatin1("/D=%1").arg(installDir.path());
+    parameters << "--prefix" << installDir.path();
+    bool sudo_started = false;
+    bool use_sudo = is_admin();
+    if (use_sudo) {
+        QStringList sudoPrograms;
+        sudoPrograms << "gksudo" << "kdesudo" << "sudo";
+        QStringList sudoParams;
+        sudoParams << filePath + " " + parameters.join(" ");
 
-    qDebug() << "Starting process " << filePath << " args: " << parameters;
-
-    if (!QProcess::startDetached(filePath, parameters)) {
+        foreach (const QString &sProg, sudoPrograms) {
+            qDebug() << "Starting process " << sProg <<" params: " << sudoParams;
+            if (!QProcess::startDetached(sProg, sudoParams)) {
+                continue;
+            } else {
+                sudo_started = true;
+                break;
+            }
+        }
+    }
+    if (!sudo_started && !QProcess::startDetached(filePath, parameters)) {
         qDebug() << "Failed to start process.";
         return;
     }
+
 #endif
     /* Installer process should now be running. We exit */