Persistent BSOD At Various Times - No Noticeable Trends

I have been getting the occasional BSOD the past month or two which I shrugged off and presumed to be driver based. After updating on each occasion and not getting one for a few days, I just assumed the problem would go away. It's been getting more and more frequent recently and after uninstalling all Firewall and antivirus programmes and still getting crashes this morning. Here is the software details:

- I am running Windows 7 Ultimate 64 Bit
- The original installed OS is Windows 7 Ultimate
- Full Retail Version
- The system is about a year and a half old.
- I reinstalled Windows in January more as a clean up than because of problems.

Few hardware information:

- ASUS M4n68T-M LE Mobo
- AMD Athlon II X3 440 Processor (3 CPUs), ~3.0GHz
- Nvidia GeForce GTS 450 Graphics Card
- 4 GB RAM
- Previously had AVG and ZoneAlarm installed, both uninstalled, still get BSOD (I am aware Antivirus, particularly AVG, is a common cause of BSOD)

I keep all my drivers up to date as much as possible out of habit. Attached to this post is the necessary dump info.