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E6420 Boot loop after installing Windows 7 Pro

I recently bought a used Latitude E6420 laptop and did a clean install of Windows 7 Pro but it went into a boot loop after setting up username and time zone.

I tried both AHCI & RAID settings, non of them worked

I tested 32 bit version and i received the following error :

"windows setup could not configure windows to run on this computer's hardware"

so i used the oobe to force it to complete.

if i install the 64bit version, i won't get the error.. but both the versions ends up with the boot loop. I cant even press F8 at all.

i tried using Intel Rapid Storage Technology (Pre-OS Install) but it wouldn't  allow 64 bit unsigned drivers.

anyone else had similar issue before or knows the fix for this ?

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