Western Digital (WD360GD) hjælp!!

Pænt goddag!

Jeg har et problem med min SATA disk som er WD360GD fra Western Digital. Problemet er at min comp lagger når jeg browser,spiller,musemarkør hakker en gang imellem, jeg har taget kontakt til WD-support, men de kan ikke forstå hvad det kan være, har også taget kontakt til DFI som er mit producent mobo, jeg har gemt en txt fil som jeg har sendt frem og tilbage, men den er på engelsk men håber i fortår mit gebrokken engelsk, so here goes:

PS: jeg kører ikke i RAID, den køre som single OS disk!

Hello!

I experience (lag) when the Hdd is loading (WD360GD), i have installed all uptodate drivers/BIOS/Nforce2, but it still lags, it lags when im playing games, and just open folders in the PC, also the mouse lags (have tried changed that also)!! there's nothing wrong if i use an IDE system disk/same brand, then the system runs perfectly, my friend have the same hdd and the same motherboard as me, and he have the same problem. It's only when the sata disk/serial-ata is in use! have also testet the hdd with Western Digitals WD360GD.Data.Lifeguard and DLG.dialog and there are no errors at all, my friend have same status as me. have formatted the drive now 3 times now and still the same lag, have also tried changed psu/gfx but its still the same, i have tried all possible ways to test! remember we are two people with the same problem, so its NOT the motherboard who have errors/unfunctional!!

PS: I have NOT clocked the CPU, i don't do that, i keep my hardware ORIGINAL!!
PS: Have set the IDE-drives as secondary, just like the manual says!!

Hardware:
Motherboard: DFI LanParty Nf2 Ultra (REV_A) (BIOS: 01/07/2004)
Memory: 1GB OCZ 3200 Dual Platinium
Gfx: HIS Radeon 9800 Pro 128DDR ICEQ
OS: XP Pro