Can no longer run Pro Tools LE 7.4/Mbox 2 on Vista Laptop or XP desktop

[squat]

I installed Mbox 2 (USB) and Pro Tools LE 7 (it shows itself as 7.4, but it just says 7 on the disk and the box it came in) on my Vista Laptop in 2008. I used it once back then. Now it won't let me open the software. I tried uninstalling and reinstalling it both on the laptop and on my HP pavilion 750c desktop Windows XP (for which I have a new hard drive and for which I've downloaded service pack 3 and all other updates).

On the laptop, I've tried running the software program both as an Administrator and as a normal user: sometimes it gives notice that it's "stopped working" and says that "the application failed to initialize properly (Oxc0000005)"; other times--nothing.

On the desktop, I tried doing all of the READ THIS Before Posting suggestions with no better results. For both the laptop and the desktop the USB on the Mbox lights up and the diagnostics report that it's "working". I'm a novice and not overly computer savvy to boot. Trying to figure out just how to post to this help site took me several days.

Any ideas why the software no longer works?

The following overview report I generated today using SANDRA (which was equally confusing, I might add) regarding my laptop:

COMPUTER
Toshiba Satellite A205

PROCESSOR
Model: Intel (R) Core (TM) 2 CPU T5300 @ 1.73GHz
Speed: 1.73 GHz
Cores per Processor: 2 Units
Threads per core: 1 Unit
Type: Mobile, Dual-Core
Integrated Data Cache: 2x 32kB, Synchronous, Write-Thru, 8-Way, 64 byte line size
L2 On-board Cache: 2MB, ECC, Synchronous, ATC, 8-way, 64 byte line size, 2 threads sharing

COMPUTER
Platform Compliance: Intel Centrino Mobile Technology
Mainboard: Intel CAPELL VALLEY (NAPA) CRB
BIOS: Phoenix Techonologies LTD 1.00 03/10/2007
Bus (es): ISA X-Bus PCI PCIe IMB PCMCIA CardBus USB FireWIRE/1394 i2c/SMBus
Multi-Processor (MP) Support: No
Multi-Processor Advanced PIC (APIC): Yes
Total Memory: 3.24 GB DDR2 SO-DIMM

CHIPSET
Model: Toshiba 955XM/945GM/PM/GMS/940GML Express Processor to DRAM Controller
Front Side Bus Speed: 4x 133MHz (532MHz)
Total Memory: 4GB DDR2 SO-DIMM
Shared Memory: 8MB
Memory Bus Speed: 2x 266MHz (532 MHz)

MEMORY MODULE (S)
Memory Module: Micron 16HTF25664HY-667G1 2GB DDR2 SO-DIMM PC2-5300U
DDR2-666 (5-5-5-15 3-20-5-3)
Memory Module: Micron 16HTF25664HY-667G1 2GB DDR2 SO-DIMM PC2-5300U
DDR2-666 (5-5-5-15 3-20-5-3)

VIDEO SYSTEM
Video Adapter: Mobile Intel ® 945GM Express Chipset Family (8 SP 250MHz, Integrated Gaphics)

GRAPHICS PROCESSOR: (nothing listed in report)

STORAGE DEVICES
Hitachi HTS541612J9SA00 (120GB, SATA15:112GB (C):
Canon MP830Storage (USB): N/A (E):
MAT[bleep][bleep][bleep][bleep]ADVD-RAM UJ-850S (ATA33, DVD+-R:N/A (D):

LOGICAL STORAGE DEVICES
TOSHIBA SYSTEM VOLUME: 1GB (NTFS)
SQ004328V04 (C): 110GB (NTFS) @ Hitachi HTS541612J9SA00 (120GB, SATA150, 2.5", 5400rpm, NCQ, 7MB Cache)
Optical Drive (D): N/A 2 MAT[bleep][bleep][bleep][bleep]ADVD-RAM UJ850S (ATA33, DVD+-RW, CD-RW 2MB Cache)
Removable Drive (E): N/A @ Canon MP830Storage (USB)

PERIPHERALS
LPC Hub Controller 1: Toshiba 82801GBM (ICH7-M) LPC Interface Controller
LPC Legacy Controller 1: Winbond WPCE775LA
Audio Device: Toshiba Toshiba Satellite A100-796 audio (Realtek ALC861)
Audio Codec: Realtek Semiconductor High Definition Audio
Audio Codec: Lucent/Agere Systems (Was: AT&T MicroElectronics) HDA softmodem
Serial Port (s): 1
Disk Controller: Toshiba 82801GBM/GHM (ICH7-M) Serial ATA Storage Controller
Disk Controller: Toshiba PCIxx12 SDA Host Controller
USB Controller 1: Toshiba 82801G (ICH7) USB Universal Host Controller
USB Controller 2: Toshiba 82801G (ICH7) USB Universal Host Controller
USB Controller 3: Toshiba 82801G (ICH7) USB Universal Host Controller
USB Controller 4: Toshiba 82801G (ICH7) USB Universal Host Controller
USB Controller 5: Toshiba 82801G (ICH7) USB 2.0 Enhanced Host Controller
FireWire/1394 Controller 1: Toshiba PCIxx12 OCHI IEEE 1394 Host Contoller
CardBus/PCMCIA Controller 1: 64512 PCIxx12 Cardbus Controller
SMBus/i2c Controller 1: Intel 801xx/63xx SMBus

PRINTER & FAXES
Printer: Microsoft XPS Document Writer (600x600, Colour)
Printer: Microsoft Office Document Image Writer Driver (200x200)
Printer: Amyuni Document Converter 2.50 (1200x1200, Parallel, Colour)
Printer: Canon Inkjet MP830 Series (USB)
Printer: Adobe PDF Converter (4000x4000, Colour)
Printer: Adobe PDF Converter (4000x4000, Colour)

SCANNERS & CAMERAS
Scanner: Canon Inc. Canon Inkjet MP830 (Scanner, USB)

NETWORK SERVICES
Network Adapter: Marvell Yukon 88E8039 PCI-E fast Ethernet Controller
WirelessAdapter 1: Intel ® PRO/Wireless 3945ABG Network Connection
(802.11g (ERP), WEP n-bit, 54Mbps)

POWER MANAGEMENT
Mains (AC) Line Status: On-Line
Battery No 1: 100%


OPERATING SYSTEM
Windows System: Microsoft Windows Vista Home 6.00.6002 (Service Pack 2)
Platform Compliance: x86

WINDOWS EXPERIENCE INDEX
Current System: 3.1