Vista Ultimate x64 BSOD

I have just upgraded to 64-bit Vista for the second time, after having a lot of troubles with it the first time I tried to install it. The first time I tried to install it I was getting BSOD before the install even completed. The second time I had it running for a whole day before I started having problems. I don't really know why I keep getting BSODs and every time it's from a different driver.... the main one I'm getting is 0x000000BE. Not sure what that means. I've updated all of my drivers and got all of the Windows Updates, and I've reinstalled all the drivers as well. I really don't think there's anything wrong with my memory because it's brand new and it works fine in other Windows OSes. Is there anything I haven't done that I should have, or anything I'm missing??

I have a TV Tuner card that has no drivers for Vista x64 that I just disabled, dunno if that would help.

Specs:

Motherboard: ASRock 4CoreDual-Sata2
Memory: A-DATA DDR2 667 2x1 GB
Hard Drives: Seagate Barracuda 7200.10 80gb SATA 3.0 gb/s
Western Digital Caviar 7200 RPM 200 GB
Video: ATI Radeon X1650 PRO AGP
anything else you want to know, ask

Bug Check 0xBE: ATTEMPTED_WRITE_TO_READONLY_MEMORY

The ATTEMPTED_WRITE_TO_READONLY_MEMORY bug check has a value of 0x000000BE. This is issued if a driver attempts to write to a read-only memory segment.
Parameters

The following parameters are displayed on the blue screen.
Parameter Description
1 Virtual address of attempted write
2 PTE contents
3 Reserved
4 Reserved

If the driver responsible for the error can be identified, its name is printed on the blue screen and stored in memory at the location (PUNICODE_STRING) KiBugCheckDriver.