New System help

[nikbear]

Well I've got me new system up and running,installed SH3/GWX Gold and some of my favourite mods, and everything is looking wonderful
For the first time I've been able to run the Hi-rez fix,and the widescreen fix
Only 2 problems are somewhat spoiling this otherwise brilliant outcome
1. I'm using a Nividia GFX card and at night I get a 'Twinkle effect' on the horizon and on the Wintergarden and cables of the U-boat,is this a known anomally specific to Nividia cards,or something else
2.I'm using an onboard soundcard and all the drivers are up to date,but for some reason I can only hear the U-boat engine when I'm facing dead ahead or facing the stern,this sound problem happens on the turm,and in the control room
If I pan the camera around,turn the UZO,or face in any other direction other than Bow/Stern all I can hear is the lapping of the water against the Hull
Any help,ideas or thoughts on this matter would be greatly appreciated