HP Officejet 4620 won't scan to computer

I'm running windows 7. My computer is enabled and shows on the printer control panel. I have uninstalled and reinstall from the HP Disc. I start scan and it says "preparing to scan" on the display. Then it shows Scan could not complete Connection to computer has been lost or OCR app is not installed on computer. I get the same thing if I try to connect vis USB.
I did notice that I am unable to open the scan dialog box even after reinstall,
I've searched the forum and still lost. All the wireless printing and faxing works fine.
Any suggestions??????

All of that looks fine. Check the firmware on the printer. It may be out dated and need updating. If it updates, it might fix the problem. Let me know what happens.
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