Hi fatima07,
· What happens when you try to install the scanner drivers?
· Do you get any error message?
Follow these methods.
Method 1: Perform a Clean Boot to see if there is any software conflict as clean boot helps in eliminating software conflicts and try installing the scanner software/drivers.
Note: After performing the troubleshooting steps in clean boot, follow Step 7 from the link to return the computer to Normal startup mode.
Method 2: Uninstall the software completely and reinstall it.
Uninstall or change a program
http://windows.microsoft.com/en-US/windows-vista/Uninstall-or-change-a-program
Refer Online Support & Manuals.
Drivers & Support: Epson Stylus SX235W