Windows Defender is a software product that attempts to detect and remove malware. It was first released as a free antispyware program download for Windows XP, shipped with Windows Vista and Windows 7 and made into a full antivirus program replacing Microsoft Security Essentials as part of Windows 8 and later versions.
If you notice any resistance about your pumping schedule from your co-workers, go directly to the source and discuss any issues they have in a professional manner. If you need to clock in and clock out every time you pump, then do it. If you have to come in early and stay late to put in your hours, then do it.
You should only pump twice in a normal work day... about 2-3 hours in and then about 3 hours before the end of the day. I work 9-10 hours and only pump twice and it ends up being about every 3 hours. I feel like your supply naturally drops with pumping anyway because your body knows it's not baby.