There's no way the typically included 30-day trial of an antivirus or Office costs 50€. It must've been a full yearly subscription of one or the other, that managed to sneak in right before checkout without being de-selected.
While your mouse is over the "place order" button, after the left mouse button has moved through the first 0.2mm of its 1mm travel, but before the click is registered, the checkbox next to "1 year subscription to McAfee Anti-Virus" is automatically enabled, to better serve our customers.
Apart from the OS I got reimbursed for 4 or 5 additional items between 6 to 15€ each as far as I can remember, I don't have the details as she only told me on the phone and have no record of it. The original invoice had the following list (although it seemed different from the itemized price list that customer service had access to):
I sure as hell did not order extra antivirus or other kind of software but I guess it's possible there was some "Office and 15-month antivirus included" marketing offer that turned out to to neither be free nor optional...