The installer could not validate the contents of the 'BaseSystem' package

Hello all,
Sorry for my first post being a problem, but I am not the worlds greatest Mac person and I have been asked to support our Macs here at work.
I have had a hard drive go in a MacBook, and I have fitted a new 160Gb hard drive (upgrading from the original 80Gb one) and I am getting the above error.
I tried installing Leopard 10.5.4 from its original CD (we bought a full version when we upgraded this Macbook previously) and got the above error.
SO I thought I would have to install the original version of Tiger and upgrade from there, in the same way that I did before. I reinstalled Tiger no problems from the disks which came with the MacBook, and then tried to do the upgrade, but got the same error.
Am I doing something wrong or is there a problem do you think ?
The MacBook has been upgraded form this particular disk once before, and no changes to the MacBook have been made apart from replacing the defunct hard drive.
Thanks in advance, and I apologise if I have missed out any important needed information because as I say I am fairly new to Macs.

I have your solution! I just experienced the same problem after installing a new hard drive to replace a crashed drive in an iMac (Ambient Light Sensor) model.
I initially thought it was the optical drive and/or the Leopard DVD. I tried two Leopard DVD's and both the internal slot-load and an external FireWire drive. All resulted in the same error at the calculation stage of the install...could not verify basesystem. All hard drive tests passed.
I used the Apple Hardware Test (your original OS DVD) and what did I discover? A failed memory DIMM! Even though the Mac would boot from an external, I thought everything was OK. The failed memory DIMM is the culprit!
Here is why: The Mac OS X installer copies data to memory, then copies to the hard drive. When the copied data encountered the failed memory DIMM, the Installer kicks back the failure that it could not validate the basesystem. The data in the memory becomes corrupt because the DIMM is corrupt.
I replaced both DIMMS in my iMac (an upgrade from 1 GB to 2 GB) and sure enough, the installer is running smoothly without any problems.
So replace your memory and your problem is solved. Or figure out which DIMM went bad and replace it.

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