You cannot get your ScanSnap S510 to go online. You have the blue button with the white S in the system tray but it has a red circle and a red line through it. You have turned the power on and off, rebooted the computer but nothing helps.
Can you try connecting the scanner to a different USB port. It’s recommended to power off the computer first and then unplug the device from the existing USB port and plug it into a different USB port. Hopefully, when you power on the computer, Windows XP will find the device again and it will work properly.
Can you go into Windows device manager by going to System Properties and then the Hardware tab and make sure there isn’t any problems with the device driver for your scanner. If there is a yellow exclamation point then you will need to reload the driver. If there is a red x then you will need to re enable the device by right clicking and select enable.
Once in device manager and you see no problems with the device driver, you can try highlighting and deleting the scanner device by right clicking and selecting “delete”. There is a “Scan for hardware changes” icon in the device manager window. If you click that icon Windows will scan and find the scanner again and will try to reinstall the device driver. You could also try to update the scanner driver from within device manager instead also.
Trying to update the device driver or reinstall the driver might be the quickest way to fix your problem.

