First make a backup copy of your data file. Next go to File>Validate And Repair File and select Validate file. Run it to see if anything is corrupted in your data file. Hopefully you have been saving backup files since you last validated the file.
What version of Quicken are you using? Also can you post a screen shot of where the -10,900.00 value is being displayed?
@CMH hawley Normally your file shoud be located in C:\Users\UserName\Documents\Quicken\FileName.QDF. If it is not in this location I would copy it there, open that file, close the file then delete the file in the location that you moved it from. Quicken should update normally from there on.