Yes both installations were on the same computer, only have the LT2011 and I did migrate the settings.
Also having fatal errors on a few other computers with LT2011? all with the settings migrated!!
Is it better not to migrate the settings?
Yes, migration is the problem: you had a problem in 2010, and by migrating,
you took it along with you to 2011.
Backup all of your files, and all of your customizations for both programs.
Follow Autodesk's Uninstall AutoCAD instructions: