Why Macbook won't start after unsuccessful software update (BSoD) ?

My Macbook is not starting after an unsuccessful attempt to do a software update.
There were 5 updates available but none would work, so I downloaded a couple of updates individually from Apple's website.
But these individual updates did not work as well and an error message said that the digital certificate may have been tampered with.
After retrying an iTunes update, the message that I needed to restart my computer appeared.
Since then on every start up attempt, I get the Apple icon and then the same message to restart my computer appears.
I know what the system looks like with a HDD failure and this is not it.
Clearly a software issue has caused a hardware failure somehow.
I am wanting to know if anyone else has experienced this or if there is a recent bug or glitch within the software update process that is causing the problem.
Thanks in advance for your assistance.

After obtaining and installing another HD (250 GB), it appears that something is quickly returning me to the same place.
The time lost within installing the HD and reinstalling the various software programs is becoming a little too high for me.
I bought and installed Leopard to avoid going through anything Tiger may have had that brought my Macbook to its knees.
But now here I am again less than 1 month after installing the new HD and installing Leopard with a Macbook that simply will not work.
To top it all off, I bought an external HD to use Time Machine today and never have had the opportunity to backup everything.
Any ideas are definitely appreciated in advance.
My biggest concern right now is that it appears that the Random Shutdown Syndrome (RSS) either has returned or something is allowing the temperature to escalate and overheating a board or something internally.

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