Arrow graphical glitch

[Dr_Imp]

Hi, I've done a brief search but haven't seen this problem posted before. I've just upgraded to Vista, installed TQ:IT and started playing. No major hiccoughs, but there's a graphical glitch whenever I or a monster fires a bow: the "trace" that the arrow leaves is delayed by about a second.

It's an odd bug, the shaddow of the arrow travels to the target correctly, there's about a second pause, then the trace effect plays. It's quite annoying, and makes busy fights more confusing.

I've tried turning each of the graphical options (tick boxes) off one at a time, with no appreciable effect.

Does anyone have any idea for possible solutions?

[Dr_Imp]

Some extra information: part of the arrow trace does appear instantly, but only stretches about 1/3 of the width of the screen, the rest of the trail appears about 1 second later.

I'm running on a Core 2 Duo Quad 2.5 GHz, 4 GB RAM, Asus motherboard (P5Q-Pro I think), with an nVidia GTX 260 video card. The OS is vista, and I'm running all the latest chipset and other drivers.

Has anyone seen anything similar, or does anyone have any ideas on things I could try to solve this problem?