Vista - Problem with Microsoft Project 2007

OK, so, I'm in Computer Science (IT) so I have an entire course on how to use Microsoft Project 2007. They make us buy a little how-to book. I'm following that book as an homework.

So here is the problem. From the Resource Sheet, I choose a resource. Then, I go to Tools -> Change Working Time. I then click on the tab "Work Week". Then, I create a new exception for the resource. Then, in the boxes next to it, in the drop boxes, there's calendar to set when it begins and where it ends, right? Each time that I want to set the end day, Microsoft Project 2007 crashes automatically. It happens sometimes on the start day too.

Anyone can help with that?

P.S Word, Access, Excel and PowerPoint are installed too, but in French. Project 2007 is in English.

EDIT

Ah... Project doesn't like it when we select Januray 1st to December 31st when we are January 10...