Welcome to the Best forum for Boxsters on the internet. You have picked my favorite color and year. I have a 98 triple black and had the same issues as you! So without further adieu my driver door lock just spun as yours. This is the part that fixed it. Picked up on Amazon. Buy 2, 1 for spare. Pelican has a DIY that can get you to the door handle. I repaired mine, but you could take the part and the door lock assy to a locksmith and have done. There are very small springs and the internal lock keys that can get away.
RegulatorFix VW Passat Audi A4 (B5) Door Lock Repair Kit - Front (left or right)
Sold by: RegulatorFix
http://www.amazon.com/gp/product/B00BT1GUNK?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00
As far as window if you haven't then you might try reinitializing your window. Your owners manual explains how. If that doesn't work then you may need to replace the window regulator, or try the regulator bicycle cable adjuster hack.
Good Luck and enjoy your time here.
1998 Porsche Boxster
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