iTunes won't let me restore...help

Greetings all, hope you all have a wonderful holiday so far,

I have a concern about my iTunes. I am running iTunes on a Dell Inspiron 15 laptop with windows 8.1. Recently I've been trying to restore my iPad 2 from recovery mode and everytime that I confirmed I wanted to restore, this window popped up.

I've looked at the securities troubleshooting in the support page, but I found no helps. Would anyone be so kind to help me solve this issue, please? Thank you in advance and happy holidays,