Answer
This question was answered on March 2, 2005.
Much of the information contained herein may have changed since posting.
There can be a few reasons why.
The most obvious is the driver. You can fix this by going to the manufacturers web site and downloading the latest drivers.
The next reason is power. USB devises take power from the computer. If there are to many devises on it then it will fail.
Your computer is looking for an operating system. Some computers will try to boot from a USB drive. To fix this you have to go into the BIOS at boot preferably without the use hub installed. Find boot priority. And select your CD drive as the first boot device and your C: drive as the second. If you plan on booting from a floppy, then it should be floppy then CD then your hard drive C:
if it still won't work. Then just connect the thing after your computer boots and all should be well.