So can i install my wallet on two different computers but only stake on one?
I would recommend not doing that, but technically it will work for a little while. What can happen is that after some time some coins could exist only in one of the two wallets. Each wallet has a reserve of about 100 addresses that can be used as change addresses. Each time one is used, a new one is randomly generated. When you have wallets on different computers, the new randomly generated addresses will be different, resulting in two wallet.dat files that are no longer identical, and contain different addresses. This can cause your coin balance to effectively split, so that some coins only exist in one of your two wallets.
IF you have a lot of experience working with coin wallets, and want to accept the risk that things may go wrong, then go for it, but I can't recommend it as a good idea.
you CAN have two different wallets, with different sets of coins in them, on different computers, that works just fine. The issue is when you have the same coins, in two different wallets that are being actively used.
I hope that helps!
Justin