How do I uninstall LV6.1 when it asks for original disks which I don't have?

I want to uninstall LV 6.1 in order to have a clean install for 7.1.
Everytime I try to uninstall anything, it asks for the original disks that I don't have (They belonged to my former employer).
msiBlast.exe lists about 20 different pieces that I want to un-install before proceeding.

I first tried thru the control panel Add/Remove Programs.  No luck.  I then tried using msiblast.exe.  No luck.  I then brought the LV6.1 CD set from my new employer home and was able to de-install most of the items using the control panel.  Then using msiblast.exe, I was able to remove everything else except the MS Report Generation Toolkit.  I finally used the Windows Install Cleanup utililty msicuu.exe to eliminate that resilient toolkit.
After that, I deleted everything on the hard-drive that was left.  Then I went into the registery and deleted the considerable left-overs there.  In my opinion, when I upgraded to the Windows Installer 3.1 (Win XP Pro), I sealed my fate in trying to un-install LV6.1.
Now however, I have a perfectly clean LV7.1 install and am looking forward to learning the new features.  Thanks!

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