PT 8 LE launch shuts down PC

[SonOfSound]

Hi all, long time listener, first time caller here.
I've been running PT LE 8 on my PC for a few years, but recently moved and after the move I started getting the H/W buffer overrun message, glitchy shut downs, freeze ups, etc. Even a warning at power up that there was an error in memory slot 2, which is Greek to me. I wondered if my tower got damaged by the move or...?
I never let Windows update itself, as back in the day the update to SP2 caused problems, so I'm still at SP1.
I tried uninstalling and reinstalling from the DVD and followed the Avid optimal performance setup instructions found here in the DUC and then PT launched and seemed fine. I recorded a few short sessions using only one input and found it to be doing great. Then the H/W overrun messages started again. I could often only record a few seconds of guitar on one track and it would stop.
Exasperated, I tried installing Reaper and using my Digi 003 rack as the interface. This meant using the legacy asio drivers. Reaper shut my computer down at startup. Then, when I tried Pro Tools it too crashed my computer at startup. It launches, but when it gets to the "building components" part I go to the blue screen of death.
I have contemplated a new PC, switching to Mac, a total rebuild of my current PC, but all I want to do is get Pro Tools to launch and run smoothly again.
Any wisdom from the DUC would be wonderful, and thanks!
-Rob
SiSoftware Sandra

ID
Host Name : R-PC
Workgroup : WORKGROUP

Computer
Model : HP xw8600 Workstation 103C_53335X
Serial Number : 2UA84*****
Chassis : HP Mini Tower
Mainboard : HP 0A98h
Serial Number : 2UA84*****
BIOS : HP 786F5 v01.35 04/28/2009
Total Memory : 8GB DDR2 FB-DIMM

Processors
Processor : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz (4C 2.33GHz, 2x 6MB L2)
Processor : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz (4C 2.33GHz, 2x 6MB L2)
Socket/Slot : FC-LGA6

Chipset
Memory Controller : HP 5400B Chipset Memory Controller Hub 4x 333MHz (1.33GHz), 2x 2GB DDR2 FB-DIMM 666MHz 128-bit

Memory Module(s)
Memory Module : Hynix (Hyundai) HYMP351F72AMP4N3Y5 2GB ECC DDR2 FB-DIMM PC2-5300F DDR2-666 (5-5-5-15 3-20-5-3)
Memory Module : Hynix (Hyundai) HYMP351F72AMP4N3Y5 2GB ECC DDR2 FB-DIMM PC2-5300F DDR2-666 (5-5-5-15 3-20-5-3)
Memory Module : Hynix (Hyundai) HYMP351F72AMP4N3Y5 2GB ECC DDR2 FB-DIMM PC2-5300F DDR2-666 (5-5-5-15 3-20-5-3)
Memory Module : Hynix (Hyundai) HYMP351F72AMP4N3Y5 2GB ECC DDR2 FB-DIMM PC2-5300F DDR2-666 (5-5-5-15 3-20-5-3)
Memory Module : Hynix (Hyundai) HYMP351F72AMP4N3Y5 2GB ECC DDR2 FB-DIMM PC2-5300F DDR2-666 (5-5-5-15 3-20-5-3)
Memory Module : Hynix (Hyundai) HYMP351F72AMP4N3Y5 2GB ECC DDR2 FB-DIMM PC2-5300F DDR2-666 (5-5-5-15 3-20-5-3)

Video System
Monitor/Panel : Hewlett Packard HP 2009
(1600x1200, 19.9")
Video Adapter : NVIDIA Quadro CX (24CU 192SP SM4.0 1.2GHz, 1.5GB DDR3 1.6GHz 384-bit, PCIe 2.00 x16)

Graphics Processor
OpenCL GP Processor : NVIDIA Quadro CX (192SP 24C 1.2GHz, 1.5GB DDR3 1.6GHz 384-bit)
Compute Shader Processor : NVIDIA Quadro CX (192SP 24C 1.2GHz, 1.5GB DDR3 1.6GHz 384-bit)
CUDA GP Processor : NVIDIA Quadro CX (192SP 24C 1.2GHz, 1.5GB DDR3 1.6GHz 384-bit)

Storage Devices
Seagate ST32000641AS (2TB, SATA600, 3.5", 7200rpm) : 2TB (C:)
MB0500EAMZD (500.1GB, SATA300, 3.5", 7200rpm) : 466GB (D:)
MB0500EAMZD (500.1GB, SATA300, 3.5", 7200rpm) : 466GB (E:)
MB0500EAMZD (500.1GB, SATA300, 3.5", 7200rpm) : 466GB (F:)
TSSTcorp CDDVDW TS-H653Q (SATA150, DVD+-RW, CD-RW, 2MB Cache) : N/A (G:)

Logical Storage Devices
Hard Disk (C:) : 2TB (NTFS) @ Seagate ST32000641AS (2TB, SATA600, 3.5", 7200rpm)
Sarlac (D:) : 466GB (NTFS) @ MB0500EAMZD (500.1GB, SATA300, 3.5", 7200rpm)
Pro Tools Session Audio (E:) : 466GB (NTFS) @ MB0500EAMZD (500.1GB, SATA300, 3.5", 7200rpm)
F (F:) : 466GB (NTFS) @ MB0500EAMZD (500.1GB, SATA300, 3.5", 7200rpm)
Optical Drive (G:) : N/A @ TSSTcorp CDDVDW TS-H653Q (SATA150, DVD+-RW, CD-RW, 2MB Cache)

Peripherals
LPC Hub Controller 1 : HP 631xESB/6321ESB/3100 LPC Interface Controller
LPC Legacy Controller 1 : SMSC SCH5317-B
Audio Device : HP Enterprise Southbridge High Definition Audio
Audio Codec : Realtek Semi 262 High Definition Audio
Serial Port(s) : 1
Disk Controller : HP 631xESB/6321ESB/3100 Ultra ATA Storage Controller
Disk Controller : HP Enterprise Southbridge SATA cc=RAID
Disk Controller : HP SAS 3000 series, 8-port with 1068 -StorPort
USB Controller 1 : HP 631xESB/6321ESB/3100 Chipset USB Universal Host Controller #1
USB Controller 2 : HP 631xESB/6321ESB/3100 Chipset USB Universal Host Controller #2
USB Controller 3 : HP 631xESB/6321ESB/3100 Chipset USB Universal Host Controller #3
USB Controller 4 : HP 631xESB/6321ESB/3100 Chipset USB Universal Host Controller #4
USB Controller 5 : HP 631xESB/6321ESB/3100 Chipset USB2 Enhanced Host Controller
FireWire/1394 Controller 1 : Avlab Technology VT6306 VIA Fire II IEEE-1394 OHCI Link Layer Controller
FireWire/1394 Controller 2 : HP TSB43AB22 1394a-2000 OHCI PHY/Link-Layer Controller
SMBus/i2c Controller 1 : Intel 5X00/7X00/8X00 XMB Ch 21-0 SMBus
SMBus/i2c Controller 2 : Intel 5X00/7X00/8X00 XMB Ch 21-1 SMBus
SMBus/i2c Controller 3 : Intel 5X00/7X00/8X00 XMB Ch 21-0 SMBus
SMBus/i2c Controller 4 : Intel 5X00/7X00/8X00 XMB Ch 21-1 SMBus
SMBus/i2c Controller 5 : Intel 5X00/7X00/8X00 XMB Ch 22-0 SMBus
SMBus/i2c Controller 6 : Intel 5X00/7X00/8X00 XMB Ch 22-1 SMBus
SMBus/i2c Controller 7 : Intel 5X00/7X00/8X00 XMB Ch 22-0 SMBus
SMBus/i2c Controller 8 : Intel 5X00/7X00/8X00 XMB Ch 22-1 SMBus
SMBus/i2c Controller 9 : Intel ICH SMBus

Printers and Faxes
Printer : SnagIt 9 Printer (600x600, Colour)
Printer : Send To Microsoft OneNote 2010 Driver (1200x1200, Colour)
Printer : Microsoft XPS Document Writer (600x600, Colour)
Fax : Microsoft Shared Fax Driver (200x200)
Printer : doPDF 7 Printer Driver (2400x2400, Colour)
Printer : Canon MG3100 series Printer (Colour)
Printer : Adobe PDF Converter (4000x4000, Colour)
Printer : hp psc 1200 series (600x600, USB, Colour)
Printer : hp psc 1200 series (600x600, USB, Colour)

Scanners and Cameras
Scanner : Microsoft MG3100 series _03B110000000 (Scanner, USB)

Network Services
Network Adapter : Broadcom NetXtreme Gigabit Ethernet (Ethernet)
Wireless Adapter : RT73 USB Wireless LAN Card #2 (802.11g (ERP), AES-CCMP, 24Mbps)

Operating System
Windows System : Microsoft Windows 7 Ultimate 6.01.7601 (Service Pack 1)
Platform Compliance : x64

Windows Experience Index
Current System : 5.9