I am the person that will be helping you today.
You can download the software from the following page: http://www.canon-europe.com/support/consumer_products/products/fax__multifunctionals/inkjet/pixma_mp_series/pixma_mp620b.aspx?type=drivers&language=EN&os=WINDOWS%208.1%20(64-bit)
After you download the file, open it and install.
I look forward to hearing your feedback concerning whether or not your problem is fixed.
I hope to hear back that all is working. If this is so, please do not forget to rate my help on the top of this page (choose the number of stars and click the Submit button). If it is not, please respond below.
I will be standing by,Jason