Blue Screen

Can anyone please tell me how to fix the following problem?
I just update my memory to 2GB When I started my PC the system worked fine.
Windows (XP Prof) loaded but after a few seconds a BLUE SCREEN cam up with
Stop 0x00000024, (0x001902FE, 0XBA4E3ADc, 0XBS4E37D8, 0XB9E4996B0

ntfs.sys-address B9E4996B base at B9E08009, date stamp 45cc56a7

I tock out 1 GB (DDR) ram and it worked fine.
I tried putting in the second stick but the message came up again.
I thought there might be a problem with the RAM so changed the module I had in and all worked fine.
It just wont work with both sticks.

I hope someone can help this dumb bunny

Thanks
Rick