Acer :: Aspire 5739G Win7 Desktop Lock Up

I have a big issue with my Acer Aspire 5739G laptop that I recently purchased through Ebay. Actually, I bought it from Newegg dba Fred's Fresh Deals. (Newegg sells their returned items and cosmetically damaged goods under this name on Ebay). The laptop was advertised as a possible hard drive issue (it couldn't load windows and the error code looked like a boot sector virus, so I purchased it thinking a simple reformat will fix it).

Specs:

CPU Type Intel Core 2 Duo T6600 2.2G
Screen 15.6"
Memory Size 4GB DDR3
7200RPM Hard Disk 320GB
Optical Drive DVD Super Multi
Graphics Card NVIDIA GeForce GT 240M
Video Memory 1GB
Communication Modem, Gigabit LAN and WLAN
CPU Type Intel Core 2 Duo
CPU Speed T6600(2.20GHz)
CPU FSB 800MHz
CPU L2 Cache 2MB
Chipset
Chipset Intel PM45
Display
Screen Size 15.6"
Wide Screen Support Yes
Resolution 1366 x 768
LCD Features LED backlight & Acer CineCrystal Technology
Operating Systems
Operating System Windows 7

Anyways...

After I did a fresh reformat of the hard drive and a fresh install of Windows 7, the laptop freezes/locks up after 10-30mins on the desktop. I cannot move the mouse or anything, so I have to do a hard reboot. I don't understand how it is happening.

I updated the mobo's Phoenix driver to the latest one, and tried older VGA Nvidia drivers because I thought it might be a video card driver issue; It is still locking up. I went as far as to purchase a brand new laptop hard drive and the problem still arises. There is no BSOD. As noted earlier, the computer just simply freezes. I cleared CMOS....240M GT VGA is running factory settings....I tried leaving only 1 ram stick in the laptop. I never ran through a problem like this before.

I ran it on Safe Mode and the computer seems to be working fine as long as I do simple tasks or remain idle. I did the SFC /SCANNOW in safe mode and it locks up. I attached my event view file to this email. (I tried to install RivaTuner to underclock factory settings, but the program could not load).