diff --git a/snippets/cr0.py b/snippets/cr0.py
index f352cf0..a4540e9 100644
--- a/snippets/cr0.py
+++ b/snippets/cr0.py
@@ -10,7 +10,7 @@ def cr0( value = 0 ):
     if value == 0:
         value = reg( "cr0" )    
 
-    dprintln( "CR0: %x (" % value + "".join( [  (  value & ( 1 << ( 31 - i ) ) ) and "1" or "0" for i in range(0,31) ] ) + ")" )
+    dprintln( "CR0: %x (" % value + "".join( [  (  value & ( 1 << ( 31 - i ) ) ) and "1" or "0" for i in range(0,32) ] ) + ")" )
     
     for i in range (0, 31):
         bits = { 0 : "PE", 1 : "MP", 2 : "EM", 3 : "TS", 4 : "ET", 5 : "NE", 16 : "WP", 18 : "AM", 29 : "NW", 30 : "CD", 31 : "PG"  }
@@ -26,7 +26,7 @@ if __name__ == "__main__":
        print "script is launch out of windbg"
        quit( 0 )
 
-   if (sys.argv[0] != "" ):
-       cr0( int( sys.argv[0], 16 ) )
+   if ( len( sys.argv ) > 1 ):
+       cr0( int( sys.argv[1], 16 ) )
    else:
        cr0()
diff --git a/snippets/cr4.py b/snippets/cr4.py
index a4437d8..df49f28 100644
--- a/snippets/cr4.py
+++ b/snippets/cr4.py
@@ -10,7 +10,7 @@ def cr4( value = 0 ):
     if value == 0:
         value = reg( "cr4" )    
 
-    dprintln( "CR4: %x (" % value + "".join( [  (  value & ( 1 << ( 31 - i ) ) ) and "1" or "0" for i in range(0,31) ] ) + ")" )
+    dprintln( "CR4: %x (" % value + "".join( [  (  value & ( 1 << ( 31 - i ) ) ) and "1" or "0" for i in range(0,32) ] ) + ")" )
     
     for i in range (0, 31):
         bits = { 0 : "VME", 1 : "PVI", 2 : "TSD",  3 : "DE", 4 : "PSE", 5 : "PAE",  6 : "MCE",  7 : "PGE",  8 : "PCE",  9 : "OSFXSR", 10 : "OSXMMEXCPT",   13 : "VMXE",  14 : "SMXE", 17 : "PCIDE", 18 : "OSXSAVE"  }
@@ -26,8 +26,8 @@ if __name__ == "__main__":
        print "script is launch out of windbg"
        quit( 0 )
 
-   if (sys.argv[0] != "" ):
-       cr4( int( sys.argv[0], 16 ) )
+   if len(sys.argv) > 1:
+       cr4( int( sys.argv[1], 16 ) )
    else:
        cr4()
     
diff --git a/snippets/export.py b/snippets/export.py
index 74f0af6..5aaa0fe 100644
--- a/snippets/export.py
+++ b/snippets/export.py
@@ -52,15 +52,11 @@ if __name__ == "__main__":
         print "script is launch out of windbg"
         quit( 0 )
 
-    if len( sys.argv ) == 1:
-
-        if sys.argv[0]=="":
-            dprintln( "module name not found" )
-        else:      
-            export( sys.argv[0] )
-
+    if len (sys.argv)<=0:
+        dprintln( "usage: !py export module_name ( export mask )" )
+    elif len( sys.argv ) == 2:
+        export( sys.argv[1] )
     else:
-     
-        export( sys.argv[0], sys.argv[1] )
+        export( sys.argv[1], sys.argv[2] )
 
        
diff --git a/snippets/gdt.py b/snippets/gdt.py
index 33d2e48..08a8bf8 100644
--- a/snippets/gdt.py
+++ b/snippets/gdt.py
@@ -27,7 +27,7 @@ def printGdtEntry( addr ):
         limit = ( limit << 12 ) | 0xFFF
 
 
-    dprint( "attr: %x ( " % attr  + "".join( [ ( attr & ( 1 << ( 12 - i ) ) ) and "1" or "0" for i in range(0,12) ] ) + " )" )
+    dprint( "attr: %x ( " % attr  + "".join( [ ( attr & ( 1 << ( 11 - i ) ) ) and "1" or "0" for i in range(0,12) ] ) + " )" )
     dprint( "  base: %x" % base )        
     dprintln( "  limit: %x" % limit )
     
@@ -46,22 +46,19 @@ if __name__ == "__main__":
        print "script is launch out of windbg"
        quit( 0 )
 
-   if sys.argv[0] == "help":
-       printGdtHelp()
+   gdtr = reg("gdtr")
 
-   elif len( sys.argv )==1:
-       gdtr = reg("gdtr")
-        
-       if sys.argv[0] == "":
-           for s in ( "cs", "es", "ds", "ss", "gs", "fs", "tr" ):
-               dprintln( s + " (%x):" % reg(s) )
-               printGdtEntry( gdtr + ( reg( s ) & 0xFFF8 ) )
-               dprintln("")              
-       else:
-           printGdtEntry( gdtr + ( int( sys.argv[0], 16 ) & 0xFFF8 ) )
+   if len( sys.argv)==1:
+       for s in ( "cs", "es", "ds", "ss", "gs", "fs", "tr" ):
+           dprintln( s + " (%x):" % reg(s) )
+           printGdtEntry( gdtr + ( reg( s ) & 0xFFF8 ) )
+           dprintln("")              
+
+   elif sys.argv[1] == "help":
+        printGdtHelp()      
 
    elif len( sys.argv )==2:
-       printGdtEntry( int( sys.argv[0], 16 ) + ( int( sys.argv[1], 16 ) & 0xFFF8 ) )
+        printGdtEntry( gdtr + ( int( sys.argv[1], 16 ) & 0xFFF8 ) )
 
    else:
-       printGdtHelp()
+       printGdtEntry( int( sys.argv[1], 16 ) + ( int( sys.argv[2], 16 ) & 0xFFF8 ) )
diff --git a/snippets/vmcs.py b/snippets/vmcs.py
index c621185..4e5f841 100644
--- a/snippets/vmcs.py
+++ b/snippets/vmcs.py
@@ -188,7 +188,7 @@ if __name__ == "__main__":
        print "script is launch out of windbg"
        quit( 0 )
 
-   vmcsPrint( int( sys.argv[0], 16 ) )
+   vmcsPrint( int( sys.argv[1], 16 ) )