More of a frustrated scream rather than a cry for help, but if anyone does have any ideas.... Had everything working OK with the machine, apart from analogue decoding via the Delta 410 (which I think is faulty - currently trying to get it replaced - that will teach me to buy it from the 'States - not been impressed with Digital Connection's customer service I'm afraid!!). I was running the S/PDIF out to an external amp/processor for the time being. Did some further tinkering to try testing the problem with the analogue outs on the 410, to no avail. No problem, I'll revert to S/PDIF. Also get Girder and IRMan running, and manage some reasonable WinDVD control. Yipee! Tried to go back to S/PDIF, but wierd things happening - only managed to get prologic last night. Rolled WinXP right back to base install, reinstall Delta drivers, WinDVD4 and DVDGenie. See in the DVDGenie FAQ a mention of WinDVD only supplying Prologic when DirectShow Navigation is enabled. Well, it wasn't enabled, but maybe a pointer. Since then I have rolled back, rolled forward, rolled over and kicked my legs in the air and lost count of the number of times I've reinstalled WinDVD etc. Thought I had it all working nicely, but it's now gone and died completely - NO SOUND AT ALL!!!! I used to be able to get Windows sounds out to the amp via the S/PDIF, now I get nothing. I'm sure it's all set right.... All I can think of doing now is a complete wipe of WinXp and start again from scratch. ...The joys of HCPC!!!!