I've upgraded from a Dell Dimension through two Optiplex SFF systems using the same system disk, going from Windows Vista to Windows 11.   Support Assist Never worked on the Dell Dimension.  I tried at times over the years to reinstall it but always got the same result.  After updating to WIN11 I thought  that I'd delete it, all of its services, data, registry keys and install it again.  Same results.   It runs, gives me an unreadable cluttered window lie it always does.    I am the admin of the system with admin privs.  Any thoughts as to how I can install it and get it working for the first time in 10 years?