One user had this issue and it indeed was a scheduled task in the Windows task scheduler that wasn't supposed to be there.
Download "Opera_GX_107.0.5045.37_Setup_x64.exe" from https://ftp.opera.com/pub/opera_gx/107.0.5045.37/win/.
Goto the URL opera://about, take note of the "install" path and close Opera GX.
Uninstall Opera GX but don't choose to delete your data when asked.
Delete the install folder.
Delete everything in "C:\Windows\temp" and "C:\Users\yourusername\AppData\Local\temp"
Then, hit Windows key + r to open the run dialog, type control schedtasks and press enter to open the Task Scheduler.
Then, select Task Scheduler Library and look through the list of tasks. There should be no Opera-related tasks as you uninstalled Opera GX. If there are any Opera ones, right-click and delete them.
Then, look at the "action" tab for any other entries to see if you see any mention of Opera GX and its setup file. If so, you can delete that task too.
Then, launch "Opera_GX_107.0.5045.37_Setup_x64.exe", click "options", uncheck "import data from default browser", adjust all the other options as you like and install.
That should make sure you have Opera GX from an official source and make sure you don't have any shady or broken Opera scheduled tasks.