When you go to make a save state, instead of picking a slot, go to 'File' then 'Save.' This will make a save file. You can then take this file and put it on the other computer. Load up your rom and hit 'File' and then 'Load' and browse for the save file. It should pick up where you saved your state.
go to your documents page and look for games. then go to visual boy open it and there should be a saved game. put it on a flash drive and then put it on the same area in a different computer