LAN not work when connect on VPN

I really need help with this!

If I connect to my VPN on my laptop as a remote dial in user from a remote location it works fine. I can access my IP camera and Dreambox satellite receiver by just typing in their fixed local IP addresses in my browser.

I can ping my desktop PC, BUT, I cannot access my LAN. Normally at home my laptop and PC connect on the Windows network automatically. I need to be able to access the PC on the VPN when away from home in the same way.

I have a fixed IP address with my ISP. Other fixed IPs are:
Router IP 192.168.75.1
LAPTOP 192.168.75.13
PC 192.168.75.19

I have tried the Windows and Draytek VPN clients with the same results.

I have ZoneAlarm firewall but the problem is the same if I disable it. Antivurus is AVG Free on laptop and Avast Free on desktop.

Any help appreciated.