Don’t worry, you’re Nanos are safe.
Firstly, that message just means that you have two copies of the wallet running for some reason. Just kill the old rai_wallet process or reboot to clear the old wallet process. Then you should be able to bring your wallet back up again.
Second. If you have not already done so, backup and protect your wallet seed. Click Accounts | Backup/Clipboard Wallet Seed and then paste into some type of text/doc file. This value is critical to wallet recovery in case of problems or if you decide to move your wallet to a new platform.
Third. I do encourage you to upgrade to the latest released wallet (v10.0.1). You can get it at: https://github.com/nanocurrency/raiblocks/releases. The big change from v9 is that it downloads the block data much faster.
Good luck and let me know if you have further questions/problems.
Note- RaiBlocks has been rebranded as Nano. Please use the Reddit or Discord channel for future support/questions. This site will be shutting down at some point in the future.