Blue screen after reinstall of 10.1, how to remove OS X and start over?

I updated 10.1 to 10.1.5 a month ago, then Software Update found additional updates to 10.1.5. After running them, several applications (especially Flash) stopped working correctly.
I attempted Disk Utility etc and found nothing wrong. I then attempted to uninstall 10.1.5 with the original 10.1 install disc but it does not allow that option. In desperation I tried installing 10.1 from the DVD, which it said was successful, but on reboot (after the normal MAc OSX bootup window) I get a blue screen with black-lettered clock in the upper right and a moveable mouse pointer but no desktop and all keys give only the submarine sound.
I am now running from the 10.1 System on another drive.
How do I remove all OSX stuff from my original hardrive and start over?

You cannot install a previous version of OS X over a more recent version without first erasing the hard drive (at least in your case because of the versions involved.) To reinstall 10.1 over 10.1.5 requires that you erase the hard drive, then install 10.1.
You might have saved some time and trouble by simply updating the software that wasn't working to newer versions that are compatible with the version of OS X you have installed.

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Disc.
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