Yep - yet another older program that needs a little bit of help to run in Windows XP without being a local Administrator.  To Get it to work right here’s what ya gotta do….

Grant the Users group Modify permissions to: C:\Program Files\AutoCAD LT98

For Autocad 2002 Modify the permissions on the following folder: C:\Program Files\Acadm 6

To fix the error: “This version of AutoCAD LT was not installed properly. You should reinstall AutoCAD LT immediately.” Open regedt32 and goto:

HKEY_LOCAL_MACHINE\Software\AutoDesk\

Click “Security - Permissions” then click the “Advanced” button. Double Click the line containing “Users - Read” and check “Set Value”, “Create Subkey”, and “Delete”.
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To fix the error: “Failed to update the system registry. Please try using REGEDIT.” Open regedt32 and goto:

HKEY_CLASSES_ROOT\CLSID\{5E4405B0-5374-11CE-8E71-0020AF04B1D7}

Click “Security - Permissions” then click the “Advanced” button. Double Click the line containing “Users - Read” and check “Set Value”, “Create Subkey”, and “Delete”.

AND

HKEY_CLASSES_ROOT\AutoCADLT.Drawing.4

Click “Security - Permissions” then click the “Advanced” button. Double Click the line containing “Users - Read” and check “Set Value”, “Create Subkey”, and “Delete”.

Update: For Autocad 2002 modify permissions on the following registry keys…

HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk
HKEY_CLASSES_ROOT\AutoCAD.Drawing
HKEY_CLASSES_ROOT\AutoCAD.Drawing.15
HKEY_CLASSES_ROOT\CLSID\{8E75D913-3D21-11d2-85C4-080009A0C626}

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