What operating system are you using?
It's possible you need to install the optional Twain plugin
Welcome to the forum.
However, as R_Kelly points out, this is the Photoshop Forum - PsE's "big brother."
I will Move your post to the very helpful and active Photoshop Elements Forum, where you will get quick help. Your link, and any e-mail subscriptions will follow.
I would also provide more info - just Reply to your thread, such as the OS version that you are running PsE 10 on, the make and model of your scanner, plus the number and date of any/all installed scanner drivers.
[Moved to PsE Forum]