Convert MS Access code

A long while back I wrote a short simple program in Microsoft Access to run my business. It consists of about 8 main forms and 4 databases. It is a simple event booking program. I am upgrading Access to Access 2007 and Win7 and my code will not run in 2007. It runs fine in Access 2003 on an XP machine. The code crashes in 2007 for some reason. I tried to convert the database and then run it, but that did not work. I need someone to narrow down why it is crashing, fix it and make sure it runs on Access 2007 withotu issues.