I spent a little time researching your question. I cant seem to find any drivers avaliable for a Astra 4100. There are drivers avaliable from UMAX the manufacturer of your scanner but these drivers are for the 4000 model. On UMAX's website I did find a work around for you. Click the link below it will take you there and this may correct your problem.
ftp://techville.com/htmls/Flipping%20the%20USB%20Driver%20in%20XP%20%282%29.htm
I hope this helps you out and if it does please leave me some feedback.
http://www.umax.com/download/index.jsp
You can enter your model etc. at above link and get drivers. They do seem to be compatible with Win 7.
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