what operating systemhave you installed ?
maybe the drivers must be re-installed in order to use the scanner.
resetting the wifi should work like this:
1. Press the Scan button (it also the Wireless menu button)
2. Select Wireless Settings
3. Scroll down and select Restore Network Defaults. Press Yes to acknowledge
4. The radio will turn off (the blue LED will go out). Select Enable Wireless
5. Select WPS
6. Select Push Button