Prints fine, but SCAN wil not scan

We will need to ensure the scanner is being recognized correctly. Have you had any other scanners installed on the computer previously?
We would suggest checking the DEVICE MANAGER for any conflicts.
Get to the Device Manager by:
1. Right-Click on COMPUTER or click start then right click COMPUTER
2. Left-click on PROPERTIES.
3. Select DEVICE MANAGER from the list.
In the Device Manager please check for the following:
1. Any yellow or red X's, question marks or exclamation marks related to the scanner.
2. Under the Category of Imaging Devices - Check for Epson Product name.
If IMAGING DEVICES is listed, test the scanner from PAINT. If IMAGING DEVICES is not listed then the scanner is not being recognized. We would recommend trying another USB port or cable.
To scan in Paint:
1. Click on START > ALL PROGRAMS > ACCESSORIES > PAINT.
2. Click on FILE then select FROM SCANNER OR CAMERA.
3. Choose COLOR PICTURE.
4. Scan.
Let us know if this works.
If it does not work:
It is possible your Windows Image Acquisition (WIA) service is not started.
To start this process please follow the steps listed bellow.
1. Right-Click on COMPUTER or click start then right click COMPUTER
2. Select MANAGE
3. We are looking for the Services and applications icon; please double click on that icon to open the next menu.
4. Double click on Services to access the list of available services. In the Services window we are going to scroll down to the bottom and look for the Windows Image Acquisition (WIA) Service, Please double click it with your mouse button.
6. We want to select the STOP option with your mouse button.
7. Next we want to select the START option with your Left mouse button to restore the service.
Now try scanning again. Please report back with all testing results if the situation persists.

Tirzo

Do you have a built-in camera on your vista computer? when you go to device manager do you see the cx7800 under imaging devices?