Can't install OS X Montain Lion; Failed to verify Essentials.pkg: xar_verify failed

As said, I can't install OS X Montain Lion without getting this error message in the log during installation ; Failed to verify Essentials.pkg: xar_verify failed
I've read a lot on the forums and googling this error message, and I've been reading lots of people saying it's a RAM issue. So I recently replaced my RAM from original 1gbx2 to 2gbx2 sticks without any success.
Is there an easy solution for this problem out there? Or is it something else in the hardware that is faulty?
Worth mentioning is; the problem resides with my Macbook 13 inch late 2009 and i'm using a USB stick for the installation
Thanks in advance,
Sebastian

Since Mountin Lion does not come on a DVD, did you prepare this DVD yourself?  If so, how did you do it?  Is it a full Mountain Lion installation that was placed on the DVD?
You might want to restart, hold the Option (Alt) key and select the DVD as the boot device, a hard drive that has been formatted will not show since that restart process only shows volumes that are bootable.
Select Applications, Utilities, Disk Utility.
Select the new Western Digital hard drive.
Select Partition in the DU main window.
Select Mac OS X Extended (Journaled) for the first partition if you want more than one.
Select from Options, GUID
Then Apply
Even though you did the format once, do it again incase something is messed up.  Now close DU.
From the DVD ML Utilities you need to select Install Mac OS and point that to the Western Digital hard drive...if your DVD has been properly created it should have no problems installing on the new hard drive.

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