Yop I’ve found a solution which works for me.
Just rename the file attached to this and remove the .dwg extension then run it. It will ask you if you agree to write into the registry, say yes and that’s done.
If you can’t download the file just create a blank text file, paste this sequence into and save as a .reg fil and run it.
Windows Registry Editor Version 5.00
error87.reg.dwg (336 Bytes)