Lpc2000

Hi everybody,
I'm trying to run VCOM USB driver on LPC2148. Device is being detected 
by PC but an error occurs and it's not possible to install PC driver. 
After the first detection device is not detected again (after 
unplugging and plugging USB cable).

But it's not main problem. After installing driver PLPU-S2K manually 
on my PC (Windows 2000) it is simply reseted and is not able to run 
again. I get  error "STOP: 0x0000001E ... 
KMODE_EXCEPTION_NOT_HANDLED". To run my PC again I have to remove 
PLPU-S2K driver.
What could be the reason?

Regards
Arek