Download umax scanner driver 4100 astra for windows 7

There is no manufacturer's driver available for it, but you may be able to use it on Windows 7 by installing VueScan from here: http://www.hamrick.com/

Download & install the trial version to see if it works with your scanner. If it does, a registration code to keep using it will cost you $40 (US dollars), which is still cheaper than a new scanner.