Update faq.md

Add information about how to fix corrupt wallet

wiki/faq.md

@@ -616,6 +616,16 @@ Read the how to help section on the [testnet wiki page](testnet "wikilink")
 Try running the client with `-rescan` or run the console command
 `repairwallet`.
 
+---
+### I get the error that the wallet is corrupt, how can I fix it?
+
+1. Close the Gridcoin wallet, make sure it is not minimized in the system tray.
+2. Make a backup of your wallet data folder
+3. Delete blk*.dat, the txleveldb subdirectory, and the accrual subdirectory in the wallet data folder
+4. Restart the Gridcoin wallet. It will take some time to re-sync.
+
+Note that errors like this often occur due to unexpected shutdowns and hardware issues. It is advised to make sure your hardware is stable and that you keep regular backups.
+
 ---
 ### Error when sending a transaction
 
@@ -647,4 +657,4 @@ have a lot of small transactions.
 4. Run the wallet.
 5. It will show the dialog box to choose the data directory. 
 6. Choose the new location.
-7. Right-click the Gridcoin Shortcut, select properties, and remove `-choosedatadir`
+7. Right-click the Gridcoin Shortcut, select properties, and remove `-choosedatadir`