Dave-H, if you installed Revolutions Pack 7.11 AND the AP environment space fix, you will find AP doesn't load. The problem is due to the SHELL command in CONFIG.SYS -- click START then RUN and type in SYSEDIT in the run dialog box and hit enter. Your system files will come up -- in CONFIG.SYS find this line: SHELL=COMMAND.COM /E:4096 /P and delete it. If you subsequently find that you needed the fix in order for AP to work properly then we will need to make a special AUTOEXEC.BAT file for you to use. Let me know if this is the case. Sop. Hi Sop, thanks for the quick reply! Unfortunately, I still haven't resolved the problem. I have never used Revolutions Pack BTW. I tried deleting the SHELL= line from my config.sys as you suggested. Autopatcher then kept running, and talked me through the environment space fix. That all seemed to go OK, but after the re-boot it was exactly as before, running AP just makes a DOS box pop up briefly and immediately close! I have checked config.sys, and the SHELL=COMMAND.COM /E:4096 /P line is there correctly, and the back-ups of config.sys are there OK in the C:\ root folder. As I said before, I had already manually made that modification to config.sys with no result, and it looks as if AP's automatic fixing procedure is just producing the same result. Any more ideas why if might not be running? As I said, it does run OK in Safe Mode, but not in normal mode, even with everything but explorer.exe shut down. Thanks, dave.