We have increased minimum graphics card requirement in recent nightly builds. This allows us to make Slicer run magnitudes faster on modern hardware, but sadly it also means that it is less compatible with old hardware. Latest Slicer version may not work on computers that are more then 10 years old or still using operating systems that were discontinued many years ago (such as Windows XP).
How old is the computer and what operating system and graphics card do you have?