I have 1.75 xbc that wont stake 
They will stake after 110 confirmations unless you have reserved them all for spending.
I haven't reserved any coins and after 24 hours they're still not staking, do i have to leave my computer on?
I thought as long as they're in the wallet that was all that was needed
You have a small amount of coins that are competing with larger balances of mature coins that have considerable network/staking weight than you but they should be staking once they have 110 confirms.Go into your transaction history and double click on the transactions to see how many confirmations you have.Any other issues contact mammix2 https://bitcointalk.org/index.php?action=profile;u=227772
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POS eligibility is earned when your coins have sufficient "Coin Age". Coin age refers to the amount of time the coins have been inactive. Meaning they have not been transferred across the network or moved from the wallet. 12 hours of coin age is required for your coins to be eligible to earn POS rewards. You do not need to have your client open or do anything to gain coin age. Just dont move them. You can have some coins that are eligible and others that are not in your wallet.The POS block will be for a % of those staked coins. The POS ROi as it is know varys depending on the hashrate and the POS difficulty.Coins reverved for spending are the only ones that wont earn rewards.