But a good first step would be to update your graphics drivers - if you dont know how, post your debug.err here and ask. Ideally, you want your graphics driver to be from 2006. If the one described in your debug.err is from before 2005, definately upgrade.
(Just in case, dedug.err is a plain text file,but windows wont know that. Just tell it to open in notepad when it asks, then copy and past it here)