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Let's repair the software to fix the program error. To do so:

1. Please restart your computer to close unnecessary programs. Then, back up your QuickBooks company file.
2. Click Start and then Control Panel. (In Windows 8/8.1: From the Start menu, open Search and type Control Panel. From the results, select Control Panel.)
3. Click Programs and Features. If necessary, choose Uninstall a program.
4. Click QuickBooks in the list of programs and choose Uninstall/Change.
5. Click Continue, then, Next.
6. Click Repair then Next. 
7. Choose Finish, then restart your computer if prompted.
8. Don't forget to download the latest QuickBooks release and the latest payroll tax table when you open QuickBooks.

Once done, please restart your computer and try entering a bill again.

I'm here if you have additional question.