Computers are confusing and, just when you figure out one set-up, they go and change it. When I was taught how to use a computer at school there was Windows 95. I'd just have worked that out when the school would update.
Also, software is made by people who understand how the software works. For example: You're using Word (I was quite happy with Microsoft Works Word Processor) and want to save somerthing. Where is the logical place to put the save button? Apparantly on a drop down list under the heading of 'file'.
Having said that, my friend just installed Office 2007 for me and I rather like the shinnyness of Word 2007.