Try the following:
Close All ANSYS Aqpplications.
Open Windows file explorer and type in the following in the addres line:
This should take you to
There will be a directory named:
v221 (for 2022 R1)
rename this to v221.old
now try to restart
If this doesn't work, there will be a directory named WorkbenchLogs
Check the log files in there for errors.