Actually, Register a HK company is no relationship with the HK Visa, HK Visa should be apply in HK immigration Department, or you can apply from HK consulate in your country.
Nationals of more than 170 countries and territories may visit Hong Kong without a visa/entry permit for a period ranging from 7 days to 180 days.

For more information, you can visit: http://www.immd.gov.hk