Hi aruheather. The error you're experiencing sounds like it may be a simple cached file error. This type of error can occur whenever the temporary files also known as the cache in the web browser being used has become full. It's quite easy to tackle though so just follow these instructions in Internet Explorer to go ahead and clear out the cache to make room for new files. 

1. Close all Internet Explorer windows.

2. Open a new Internet Explorer browser, then click Tools > Internet Options. (If you don't see this, press the Alt key to show the menu bar.)

3. In the General tab, under Browsing History section, click Delete.

4. In the Delete Browsing History window, select the checkboxes for Temporary Internet Files and website files and Cookies and website data.

5. Click Delete.

After you select to delete it may take a while to finish clearing the files but once it's done you can go ahead and restart the browser and try again. Here's an article as well on clearing out cache that may help you understand what happened a bit better. Let me know if you run into anything else I'll be here to help. Have a great day.