Battlefront 2: i tried mods then got rid of them and now it wont start

Unfortunately, you likely won't get much help in this forum, as mods are not supported and discouraged by EA.

A system reset may be in your future.

There is a chance your issue is related to buying on Steam, then Epic - i.e. an account issue. You can try contacting EA support directly. However, if you mention mods, they'll likely tell you that you are on your own.