I was doing my job doing various operations and calculations in Access. After saving and trying to open my document something happened to my mdb file, and it stopped. When I try to open it, an access error appears on the screen. I hope for your help.

In computer related stuff, there are many types of error. The exact error message is a pointer to what went wrong and what should be done to correct it.
Sample the exact error message here, if possible do it with screenshots.

http://allenbrowne.com/ser-47.html

http://www.mdb.repair/

Recovering from access mdb repair tool
This article may help if your database is already corrupt
Before doing anything else, make a copy of the corrupted mdb file while Access is NOT running, and without overwriting any earlier backups. This lets you try different approaches and sequences if necessary.
Next, try the built-in repair utility. This very simple solution may work with corrupted indexes, and might even get rid of a corrupted object:
• In Access 2010, click Compact and Repair Database on the Database Tools ribbon.
• In Access 2007, click the Office button (top left), then Manage.
• In Access 95 - 2003, choose Database Utilities from the Tools menu.
If this does not work, follow the steps for the symptoms of your corruption below.