Your screenshot shows what you get when you double-click on the icon for the device in the "Devices and Printers" window. It looks like you then double-clicked on the "Epson scan settings" icon. The small image at the bottom
is the "aero peek" view, which is supposed to show a window hidden behind the main, full-screen window. It
should come to the foreground when you click on it; if it doesn't try minimizing the (or even closing) the window that shows the two icons.
Have you installed the Epson software that came with your 4540? That will make configuring it a lot easier.
Otherwise, instead of double-clicking the icon for your scanner in the Devices and Printers window, right-click it. I don't have this product installed, but you should see a context menu with items such as "Properties" or
"Scanner properties." Select this and perhaps the configuration you're looking for will be available.
As far as scanning directly to email is concerned, what email program are you using? Your product's User Guide says:
Scan to PC (Email) scans your original and attaches it to a message in your e-mail program. You can select the e-mail program you want to use and resize your image, if necessary, from an option screen on your computer.
Note: This works with MAPI-type email such as Microsoft Outlook, Windows Live Mail, Mac Mail, and Entourage, but not web-based email such as Gmail.
Assuming that you've installed the Epson software, the User Guide says that your 4540 scans in 3 modes, Home, Office, or Professional. In all modes, the default is to save the scan as a jpg file. When you click the "Scan"
button, the "File save settings" window should open. This is where you could select the "save as PDF" option. When the scan finishes, you'll get another window with the options including one to scan another page to the same pdf file. See the "Scanning Special
Projects" section of your User Guide.
For further detail, read your User Guide
User's Guide (HTML Version)
User's Guide (Downloadable/Printable Version)
Epson manuals page: http://www.epson.com/cgi-bin/Store/support/supDetail.jsp?BV\_UseBVCookie=yes&oid=183406&prodoid=63091353&infoType=Doc