You could try to re-play the entire level 7 based on a savegame file which is not affected by previous crashes. Try the start_07_TEMPLE file (preferrable the .zip variant if you have WinZip or pkunzip to decode it) from ftp://ftp.soulianis.com/archive/indy/start/
If this does not work you might have a hardware or configuration problem. If you are interested refer to http://www.indyjones.net/forums/Forum3/HTML/001461.html
about the problems I formerly had.