GUI not functioning

Hi. I have an ancient dell with a intel 82865G graphics controller
that I've installed Trisquel Mini on. I can log in fine, but once I'm
logged in I can't launch programs and mousing over icons causes them
to disappear (note that everything worked the first use after install)
Command line works as it should. Reinstalling did nothing and it
passed a memtest. Any ideas as to the problem? Thanks.