Have used Photoshop CS3 for years on Window 7 with no problem 10 weeks ago purchased new PC with Windows 8.1. Loaded CS3 from CS3 Master Suite disc and it worked OK till last week then the Lasso tool stopped work that caused the key board to stop working. Restart and it is all OK till the same thing happens again so re installed CS3 and it still the same problem. Have taken the PC back to recovery points 17.09.15 also to 04.09.15 and to 26.08.15 and its still the same and have now uninstalled CS3 again and the PC is working OK. The next move will probably be back to factory reset but that is such a pain reloading every thing. Has anyone any ideas on this problem.