Windows 7: BSOD - Freezing, errors, BAD_POOL_CALLER

For the past few weeks I have been getting a Blue Screen error related to BAD_POOL_CALLER and one that referenced KERNEL.

Reports show problem with plugnplay, but I am not sure if that's the cause. I use a SanDisk 2GB SD Card to upload photos through an E: drive. Computer freezes when I'm online (I use Google Chrome).

I've tried to use WinDbg to figure out Minidump files, but have had no success. It says process is SYSTEM and issue is hardware. I've checked all hardware devices for problems but the results are negative.

Don't know what to do! Thanks a ton for the help.




SYSTEM INFO:

Gateway M-1631U
Microsoft Windows 7 Ultimate
AMD Turion 64 x2 Mobile Tech. TL-60 2000 Mhz
Phoenix Tech. LTD. 9D.05
4 GB
Wireless Connection

I've had the computer since last December and had problems with it before back in May/June when it was running Windows Vista. Guy installed MW 7 Ultimate after clearing system.. so he said!