Does device manager still see your com port?
what port is it!
it has been so many years I have to read the manual to remember the settings
open device manager & when you unplug usb from the pc & reconnect a second or 2later you should see it resort/redraw the list of devices
be sure to plug it back into the same port (at this time)
open ports see if it is com 3 (or 5 or 8 or whatever) right click on the port choose properties
remember if you draw an imaginary dividing your adapter in half the usb end is a plug & play device (assuming the driver loads correctly in
windows 11) but the db9 or db25 end is a dumb static device.
default setting
9600 baud
8 data bits
1 stop bit
no parity bit
X on/x off flow control