I would go to Xerox.com and look up their knowledge base. Here is a copy of data from their site related to this problem:
Scanned images have poor image quality, are fuzzy, unclear, or hard to read.
There are several things that can lead to poor image quality including the scan settings, dirt on the scanner, and driver problems.
If you scan as a PDF file and your scans look fuzzy when viewed in PaperPort, try right clicking on the file and selecting "Open" to open them in Adobe Reader. If they display fine in Adobe Reader then there is nothing wrong with the scans, it is simply that they are not being displayed well in PaperPort.
The following solutions can help resolve poor scan quality.Solution 1 - Adjust the scan settings
Try increasing the resolution of your scan. 300 dpi to 400 dpi should be clear for most images
Solution 2 - Clean and Calibrate the scanner
- If you are scanning in Black and White, try Grayscale or Color. Some images will not display correctly in Black and White
- You can also try adjusting the brightness and contrast
- Note: For information on adjusting your scan settings, refer to the user guide for your scanner
Note: Calibration only applies to sheetfed scanners.
Use the link below for instructions on cleaning and calibrating (if applicable) your scanner:
Solution 3 - Reinstall the scanner driver
Select a link below for instructions on reinstalling your scanner driver: