Downloading problem

[myautigirl]

We downloaded the free upgrade to hoster today and when we tried to open the file it said, 'The contents of this file cannot be unpacked. The executable you are attempting to run has been corrupted. Please obtain another copy of the file, verify it integrity and try again." It took quite a while to download this, is this going to happen again? Is there something wrong with the file?
Another problem we are having is, we have an external hard drive and when we try to shut if off on the task bar to safely remove it we are getting a message, The devices "generic volume" cannot be stopped right now. This doesn't allow us to properly remove the device from the computer. Has anyone had this problem and is there a remedy?
Thanks,
Shelley