You want to be logged (addressing)  in DOS to the root
directory e.g. C:\
and then issue the right DOS commands to REName
files.   For information, most DOS commands are sef-
documenting via
/?
Thus keystrokes
REN /?
give  you information about REName.  Keystrokes
CD /?
give information about CD = Change Directory.

To rename AUTOEXEC.BAT and CONFIG.SYS (which
are in the  C:\ directory you key:
C:
CD..
REN AUTOEXEC.BAT AUTOEXEC.BAK
REN CONFIG.SYS CONFIG.BAK

Then reboot and see if Windows starts faster.
If you want things the way they were, you can
REName these files back using the REName command.

/ start / run / MSCONFIG.EXE
is another way of altering or customising these
files and their use.

In Windows, there are usually several different ways of
doing the DOS procedures you prefer, e.g. selecting  the
icon of  your DOS application  and right clicking on
/Properties.   The panels then invite you to write
custom versions of AUTOEXEC.BAT and CONFIG.SYS
that automatically run in  a DOS box under Windows
and set up your old Tandy program the way you want.

Simplicity and convenience should guide you.  What
is simplest for you may seem the long way round to
someone else, but that is normal in Windows . . .