I just started an online course for an accounting class. Last week I was able
to download the homework, edit it (complete the work), and upload it back to
my instructor.

Today I downloaded the homework and I am unable to edit now. It says 'read
only, compatibility mode'

I have windows vista and would like to be able to work on excel and
powerpoint. I got the free trial of Microsoft Office 2007 when I bought this
PC. I'm looking for a download of Office 97-2003 but all I can find are
updates.

Any suggestions?

Thanks!