diff --git a/windows/sound.cpp b/windows/sound.cpp
index 74b4e58c..08201e18 100755
--- a/windows/sound.cpp
+++ b/windows/sound.cpp
@@ -302,13 +302,13 @@ int CSound::GetActualBufferSize ( const int iDesiredBufferSizeMono )
 
     // calculate "nearest" buffer size and set internal parameter accordingly
     // first check minimum and maximum values
-    if ( iDesiredBufferSizeMono < HWBufferInfo.lMinSize )
+    if ( iDesiredBufferSizeMono <= HWBufferInfo.lMinSize )
     {
         iActualBufferSizeMono = HWBufferInfo.lMinSize;
     }
     else
     {
-        if ( iDesiredBufferSizeMono > HWBufferInfo.lMaxSize )
+        if ( iDesiredBufferSizeMono >= HWBufferInfo.lMaxSize )
         {
             iActualBufferSizeMono = HWBufferInfo.lMaxSize;
         }
@@ -449,7 +449,13 @@ pSound = this;
     // in case we do not have a driver available, throw error
     if ( lNumDevs == 0 )
     {
-        throw CGenErr ( tr ( "No ASIO audio device (driver) found." ) );
+        throw CGenErr ( tr ( "<b>No ASIO audio device (driver) found.</b><br><br>"
+            "The " ) + APP_NAME + tr ( " software requires the low latency audio "
+            "interface <b>ASIO</b> to work properly. This is no standard "
+            "Windows audio interface and therefore a special audio driver is "
+            "required. Either your sound card has a native ASIO driver (which "
+            "is recommended) or you might want to use alternative drivers like "
+            "the ASIO4All or kX driver." ) );
     }
     asioDrivers->removeCurrentDriver();