Which version of Windows do you use ?
No, it is not a Windows issue, but I need that information for testing purpose. Try to follow the steps below to scan from your computer and let me know, what happens.
Place a document on the scanner, or, if the scanner has a document feeder, place one or more pages in the feeder. If your scanner offers both options, use the option that you prefer.
Click the Start button ,click All Programs, and then click Windows Fax and Scan.
To use Scan view, at the bottom of the left pane, click Scan.
On the toolbar, click New Scan.
In the New Scan dialog box, click the Profile list, and then click Documents. The default settings for scanning a document, which you can use or change, are automatically displayed.
To see how a document will appear when scanned, click Preview. If needed, change your scan settings, and then preview the document again. Repeat this step until you are satisfied with the preview results.
Click Scan. When the scan is complete, Windows Fax and Scan automatically displays the document so that you can view and manage it.
No, it is generally under Accessories, as you are using Vista, which is a old Windows version, I thought that, you will be able to find the program, that is why skipped those steps to find the program.
Are you able to scan from your printer, using the printer's control panel ?
Yes, that is correct and that is the reason for which I have asked you try those steps, so that I can understand, if the problem is due to Epson software or any hardware issues, if you are able to scan using my steps then, my answer will be to install Epson program. As I cannot see your PC, I have to do these extra steps to make sure of the problem. Anyway, I am happy to hear that your problem is solved now. Please let me know, if you need any further help.