PCI Driver安装问题

在inf文件里定义: PCI\\VEN_1172&DEV_1998&SUBSYS_00000001
不能正确识别驱动程序。如果去掉SubSystem ID的定义，
即只定义为：PCI\\VEN_1172&DEV_1998 就可以正确安装。
在2000下用NTDDK的PCI Tools检查硬件配置如下：

Altera, DevID=1998

Type:      Unknown Adapter Type
Bus:       0
Device:    15
Function:  0
Revision:  7

Vendor ID ................   0   1172
Device ID ................   2   1998
Command ..................   4   0002
Status ...................   6   0200
Revision ID ..............   8   07
Prog. I/F ................   9   00
Sub Class Code ...........   A   00
Class Code ...............   B   FF
Cache Line Size ..........   C   00
Latency Timer ............   D   03
Header Type ..............   E   00
BIST .....................   F   00
Base Address 0 ...........  10   FFAF 0000
Base Address 1 ...........  14   0000 0000
Base Address 2 ...........  18   0000 0000
Base Address 3 ...........  1C   0000 0000
Base Address 4 ...........  20   0000 0000
Base Address 5 ...........  24   0000 0000
Cardbus CIS Pointer ......  28   0000 0000
Subsystem Vendor ID ......  2C   0000
Subsystem ID .............  2E   0001
Expansion ROM Base Address  30   0000 0000
Reserved .................  34   0000 0000
Reserved .................  38   0000 0000
Interrupt Line ...........  3C   09
Interrupt Pin ............  3D   01
Min_Gnt ..................  3E   00
Max_Lat ..................  3F   00
Device Dependent .........  40   0000 0000
.....
           .....

请问到底是什么原因？很困惑。。。