BSOD While Running CPU Intensive Programs - Bug Check Code 0x00000124

I went through my first attempt at building my own computer about 2 months ago and the process went fine. But about a week after I began using it, I started getting BSOD that seemed happen whenever I would run a CPU intensive program (Handbrake, VMWare Player, etc). It won't always crash when running one of these, but maybe once every couple of days when running a program such as this.I've tried the following after researching online: Ran memtest86 overnight, no errors found in RAM Put in a beefier CPU cooler (ZALMAN CNPS9500A-LED 92mm 2 Ball CPU Cooler) to lower the CPU temps Reinstalled to a fresh version of Windows 7 Ran 'verifier.exe' according to the steps shown in many posts here - the result of this is that about 30-60 seconds after I login to Windows, a BSOD occurs - this is repeatable every time until I cancel the verifier program The specs of this computer are as follows: Intel Core i7 3770 processor Microsoft Windows 7 Professional x64 Antec BP550 Plus 550W Continuous Power ATX12V V2.2 80 PLUS Certified Modular Active PFC Power Supply G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9D-16GBXL ASUS Sabertooth Z77 LGA 1155 Intel Z77 HDMI SATA 6Gb/z USB 3.0 ATX Intel Motherboard NVIDIA GTX GeForce 550ti (installed AFTER the BSOD started occurring) Crucial M4 2.5" 64 GB SATA III Internal SSD Seagate 300 GB HDD (don't have the exact model here) ASUS 24x DVD-RW ?