Hello Michal,
Thank you for your message.
The reason why this happens is that the Host settings are located in the HKEY_LOCAL_MACHINE/SYSTEM/Remote Utilities key and when Windows upgrades, it resets the SYSTEM registry key values. That is why the Host settings are reset including the Internet-ID and access password.
In the upcoming 6.5 update we will change the location for the Host settings and move them into HKEY_LOCAL_MACHINE/Software key instead. So starting version 6.5 this issue will be no more.
Currently, a solution could be exporting the HKEY_LOCAL_MACHINE/SYSTEM/Remote Utilities key and after Windows has been upgraded, importing it back into the registry.
Hope that helps.