If you purchased your HK 998 from an authorized reseller (e.g., Amazon, Newegg, or a local electronics chain), check their product page. Some resellers host verified driver downloads to reduce customer support tickets.
Possibly, but Siyoteam has likely stopped supporting Windows 7. If you must use Windows 7, try the latest driver that lists “Windows 7” compatibility. Otherwise, expect limited functionality. siyoteam hk 998 driver download