Question : Problem: VNC for PC to connect Mac

Which VNC version i have to use for PC to connect to Mac built-in VNC client?

Answer : Problem: VNC for PC to connect Mac

Any version of VNC should (theoretically) work with any other version.  Popular versions for Windows are

http://www.realvnc.com/
http://www.tightvnc.com/
http://www.uvnc.com/