open the quickbooks in safe mode by
holding down the ctrl key while double clicking on the quickbooks icon to open it
that should open the quickbooks in safe mode with no company file
file / open company
and browse to my documents and select the file.
If the quickbooks opens but the new company file still wont open
You can try doing a verify and rebuild on it
file / file operations / verify rebuild
or using the company file diagnostic tool
If those do not work you need to restore a backup
If the quickbooks will not open even in safe mode you need to reinstall the quickbooks software
QUICKBOOKS CLEAN INSTALL INSTRUCTIONS
try doing a clean install with the instructions on this page. It should not effect your data but i always recomend
making sure that you have a good back up and / or a copy of your data file ( it ends .qbw ) in a safe place such as
a flash drive or another folder.
It requires that you have a copy of the quickbooks install cd or download. If you downloaded from intuit you can
get another copy free.
If you purchased from Intuit directly you can download again for 3 years.
For quickbooks go to https://www.intuit.com/login/
click on cart orders downloads
sign in with your intuit id and password. ( usually your email address is the id )
click on downloads and unlocks
That should give you a list of any intuit product that you purchased online within the last 3 years with a download
This page has complete instructions for the uninstall and reinstall INCLUDING a clean install utility that you want
to download and run.