I have used Solidworks 2011 student version (12 month license usage)  for about 4 months, then suddenly I won't be able to start it up again, just a flashing symbol for a few seconds, tried to re-start the computer several times, even remove and re-install the software again, but it did not work.  My computer is an Window XP, Pentium 4, 2GB RAM, worked very well for very thing except Solidworks recently. If any one has any idea to fix it, please advise, thanks a lot.