How can you change the IRQ in Win XP pro?

Hi;
I have got a ISA scsi card which was working fine when I had Win 98/Me running on my computer, since I have upgraded to win Xp Pro, it does not work properly,
the Scsi manufacturer does not have any upgrade driver for Win xp.( Adaptec AVA 1502 AE, that is 25 pin scsi)I use it for my Zip drive and Scanner.

well somtetimes computer find the scsi sometimes it does not, anyway after searching and searching, somewhere in the Google newsgroup someone posted that if I put the Irq to 9 ( you can change the irq on the card manually) and address to 140 it will work,
well I have tried it and changed it both on card and in Control panel and it did work, but it was just onec and I could not ever make it work again,

the problem so far is my Network card takes the Irq 9 and I can not force it to take Irq 12 ( which is free),

If somehow I can make the network card take the irq 12 I believe my scsi will work, but under win xp pro device manager, when you look at the network card property, all setting feature in irq setting are dimmed and you can not change anything, well it is working ,maybe this the reason it does not allow you to change the Irq.

I have installed a different network card, changed its place( from PCI slot 2 to PCI slot 3) but it still get the Irq 9.


anyway How can I change the Irq of the network?

is there any other solution to solve this problem?


Thanx
I appreciate your reply.