Random blue screen crashes every so often

Hi im new to these forums and i recently built a new system with a little help as im a bit new to it all and i got windows 7 as i had been stuck on XP forever and i thought this would be a great change but since i have installed it i have had constant blue screen crashes at random and prgrams either not closing down or not wanting to open at all, infact i had to uninstall firefox as it just kept crashing as soon as i opend it, its really concerning me that something is seriously wrong. here is an example of one of the blue screen crash errors i got when i restarted my system after one this morning.

Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.768.3
BCCode: 19
BCP1: 00000020
BCP2: 8A6C64A8
BCP3: 8A6C6AA0
BCP4: 0ABF0209
OS Version: 6_1_7600
Service Pack: 0_0
Product: 768_1
C:\Windows\Minidump\032010-18564-01.dmp
C:\Users\Adam\AppData\Local\Temp\WER-32807-0.sysdata.xml

my system specs are

Windows 7 Home premium 32-bit
Corsair 2GB DDR3 PC3-10666C9 1333MHz Dual Channel Kit
Gigabyte GA-MA785GMT-UD2H AMD 785G (Socket AM3) DDR3 microATX Motherboard
AMD Phenom II X2 Dual Core 550 3.10GHz Black Edition (Socket AM3)
Club 3D GeForce GT 240 512MB GDDR5 PCI-Express Graphics Card
Samsung SpinPoint F3 1TB SATA-II 32MB Cache

Any and all help with this issue would be great and i would be very greatfull as im not a great tech head and i kind of panic when i see things like this happen, thank you :).

We will need the .dmp file for anaylsis.. read this.. [1 - Novice] How to ask for help with a BSOD problem