Picture and audio stutter/corruption with service pack on xp

#1
Hi all!
I have this problem, which seems very random but I don't seem to get it to resolve:
I have the latest progDVB with a SkyStar 2 PCI running on a Media Center XP SP2 with the dvb service pack, my problem is that progDVB sometimes has these corruptions where the picture is very corrupted and the audio is unbearable. It happens on program startup and doesn't stop, even by restarting progDVB or my system. I tried placing my tuner in another slot but it totally killed progDVB so badly /didn't recognize my card anymore, even after placing it back/ that I had to reinstall windows and it started to do this again. What could I do, please someone help me?

also I don't use any plugins and I used the default codecs so I don't really know what's wrong.

ps. picture and audio sometimes froze randomly so I had to switch to the channel again to watch it, if someone knows how to resolve that too, please help me!

Thanks!

A desperate newbie lost in the DVB-S world