Hi all,I am having a real problem with AutoCAD LT 2000i. Either shortly after starting AutoCAD, or when opening a file I get the message:FATAL ERRORUnhandled access violation reading 0x50d1760. Exception at 654fc817hThe program then closes.I have noticed that while the first number in the dialogue box (0x50d1760) changes each time, e.g. 0x36b8b7c or 0x4588ccc, the second number (654fc817h) remains constant.I don't think the problem is caused by a corrupt file, as this has happened with a number of different files I have opened and attempted to work on today.I should also mention that when AutoCAD is starting a small dialogue box appears saying:Failed to update the system registry. Please try using REGEDIT.There is an OK button in the box, and it goes away after AutoCAD is up and running.Any help / suggestions would be VERY appreciated.

[QUOTE=AJArch]Hi all,I am having a real problem with AutoCAD LT 2000i. Either shortly after starting AutoCAD, or when opening a file I get the message:FATAL ERRORUnhandled access violation reading 0x50d1760. Exception at 654fc817hThe program then closes.I have noticed that while the first number in the dialogue box (0x50d1760) changes each time, e.g. 0x36b8b7c or 0x4588ccc, the second number (654fc817h) remains constant.I don't think the problem is caused by a corrupt file, as this has happened with a number of different files I have opened and attempted to work on today.I should also mention that when AutoCAD is starting a small dialogue box appears saying:Failed to update the system registry. Please try using REGEDIT.There is an OK button in the box, and it goes away after AutoCAD is up and running.Any help / suggestions would be VERY appreciated. [/QUOTE] It is problem about your system registries is clear.Use any program about cleaning and repair registries or reinstall again but before delete old registries.