According to your description:
1. Because you didn't provide the detailed model of the machine, you can't know your machine information.
It is recommended that you use a genuine system. If your machine still has a genuine system, I suggest you start the machine, press F4 to enter the restore interface, and then select Restore or Complete Restore. (Under normal circumstances, only the data of disk C is recovered. In order to avoid losing important data, it is recommended that you back up your files. )
2. I suggest you check whether the online banking plug-in supports the system you are using, or whether the IE version meets the requirements.
3. Kill viruses, etc. , and eliminate the machine system failure. Uninstall the plug-in and try to reinstall it.
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