It's probably a resource issue if you have an older computer and moreso, if the crashes happen with other applications, particularly more memory/CPU intensive ones.

Otherwise, it's more likely that you have a case of corrupt system files.
First check your resources (RAM and page file) via the task manager (ctrl+alt+del), and if those figures seem ok, you might want to try getting a hold of a Windows CD and running a repair installation. You can also run repairs using OEM rescue CDs that come with most non-custom computers.

Running a system repair will basically reinstall all critical parts of your system without removing your data. That means you may lose configuration settings like wallpapers and screensavers, but it won't delete, for example, your music.

What are your system specs (Windows version, CPU, RAM, video card, etc.)?