GTAVC (PC) Reflection Problem w 8600gt!

I've just bought and installed my 8600gt card, it works fine on most of my game except GTAVC(Vice City), The problem is that there isn't any reflection of the car lights on the road when it's raining(the weather), I've tried to configure my NVIDIA Panel by moving the slide to Performance, removed my newest forceware(186.18) and installed the older one(175.19), took my card out and plugged it back in but so far no luck, I have a fresh install of XPSP3. I've also tried to patch the game to ver 1.1, changed the compatible mode to Windows 98, reinstalled it but the problem still occur. It also made the game lag a little bit while driving.
This didn't happen with my older card(FX5500) or my onboard chip(GMA950).
My specs:
CPU:E2180 2.0ghz
MOBO: 945GCT-M2/1333
VGA:ASUS EN8600GT 256MB GDDR3
RAM: 2GB DDR2 667mhz(dual channel)
PSU: 400W(real) 21A on 12V rail
HDD: Western 120GB SATA
DVD: LG 52X.
OS: Windows XP SP3 (32bit)
DirectX 9.0c (March 2009)
Any1 have the same problem as me??? Any idea to fix it???(Sorry about my bad English)

Here are two pics here for comparison.
GMA950 w reflection


en8600GT w/o reflection

Really? I'm wondering if there's any1 here has the same problem as me.

That is why keep my old compaq with its vintage geforce 256 around.