Michael,
I split your post from the other thread you created it in simply because it was unrelated to that post.
This issue normally occurs when your Temp or Log directories are not writable by Joomla. Please go into the System Information area and make sure that all directories are marked in green as Writable. If not, they will need to be fixed.
If that doesn't solve the problem, just let us know, and we'll help how we can.
Thanks,
Alex