Hi Martin, We experience a nasty problem with our TV cards on Windows XP systems after SP1 had been installed. Internet search has shown (see links below) that this problem occurs with TV cards of any manufacturer. It is pretty obvious that it had been introduced with SP1 but the cause is still unclear. Microsoft Messenger Msmsgs.exe P.S.: Here some newsgroups entries describing the problem (After googling for <XP SP1 TV Sound>) English: http://computing.net/windowsxp/wwwboard/forum/37525.html http://groups.google.de/groups?q=XP+SP1+TV+Sound&hl=de&lr=&ie=UTF-8&oe=UTF-8&selm=vkcF9.3414%24dp1.78409%40newsfep3-gui.server.ntli.net&rnum=4 http://groups.google.de/groups?hl=de&lr=&ie=UTF-8&oe=UTF-8&threadm=OFOcDtMkCHA.2692%40tkmsftngp08&rnum=9&prev=/groups%3Fq%3DXP%2BSP1%2BTV%2BSound%26hl%3Dde%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26selm%3DOFOcDtMkCHA.2692%2540tkmsftngp08%26rnum%3D9 German: http://groups.google.de/groups?hl=de&lr=&ie=UTF-8&oe=UTF-8&threadm=apgrrb%24jbi%2406%241%40news.t-online.com&rnum=1&prev=/groups%3Fq%3DXP%2BSP1%2BTV%2BTon%26hl%3Dde%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26selm%3Dapgrrb%2524jbi%252406%25241%2540news.t-online.com%26rnum%3D1 -------------------------------------------------------------------------------- Friedhelm Birth R & D TerraTec Electronic GmbH Herrenpfad 38 D-41334 Nettetal Phone: +49-2157-8179-31 Fax: +49-2157-8179-22 Email: friedhelm.birth@xxxxxxxxxxx Internet: www.terratec.com -------------------------------------------------------------------------------- This message is intended only for the use of the addressee(s) and may contain information that is PRIVILEGED and CONFIDENTIAL. If you are not the intended recipient, dissemination of this communication is prohibited. If you have received this communication in error, please erase all copies of the message and its attachments and notify postmaster@xxxxxxxxxxxx immediately. IT IS NOT ALLOWED TO PUBLISH ANY PART OF THIS MESSAGE WITHOUT THE AUTHOR'S WRITTEN PERMISSION. ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/