The reason behind QuickBooks error 61 could be a malware or virus attack and a corrupted .QBW & .TLG file. There are some effective methods to get rid of QB error 61 - on your QuickBooks desktop open file tab and click Utilities > Rebuild Data, now click Ok when prompted to create a backup company file. Do not get afraid if QuickBooks not responding message appears, click Ok on notification message Rebuild has completed. Additionally, update your QB desktop at regular intervals. This way, you can quickly troubleshoot the QuickBooks Error 61.