Any way to update Premier Pro circa 2000?

Hello!  I have a registered version of PP circa 2000 that was part of a bundle purchased for my Windows XP computer.  Software runs in conjunction with a Matrox RTX10 capture card.  I would like to know how I might upgrade my software to PP 1.5 or an interation nearby to maybe get the software nudged to 2005.  I don't have the performance attributes on this computer to take it much further and enjoy the program, albeit a bit buggy.  Thank you in advance for your helpful commentary.