Okay no your temps are fine, your not overheating (please see my instructions for including MSI Afterburner then when playing comparing to these idle temps). It may be a simple the Planetside needs to be reinstalled, as no other games are having this issue correct?
You can download Driver Fusion or 3DGuru's Driver Sweeper. Uninstall the Nvidia drivers through control panel, then run Driver Fusion / Sweeper to really clean out the Nvidia drivers. Reboot. You will be in VGA mode, go to Nvidia and download the latest drivers installing them now clean and retest Planetside. If your still having issues try reducing the graphics level your setting to (i.e. your on Ultra go down to High) and always turn off OverClocking if you have issues.
As for this thread issue "It only happens in planetside 2, and when my family watches netflix or uses the other computers i seem to lag alot more" this is back to what I was saying, a wired connection WILL NOT HELP. Your issues is Quality of Service and your family's Internet package. As the Internet passes along all the data to your router to then pass to each machine asking for the data, it normally does it like a hose.. just spews it out without thought. If the router is set with QoS and all devices (iPhones, laptops, PS3s, etc.) have QoS enabled, then the router put those thing at the top of it's "list" as first priority to pass along, like Videos (Netflix), Video Chat, Telephone Service (VoIP), then the next ones would be say Web pages, then after that RSS feeds, and so on. So those at the top of 'the list' are first priority. As I said if you don't have it enabled to enhance your game play (If router sees games using Port 1234 then they get first priority) then you will continue to lag, wired or wirelessly. Further if you went with the 'cheap Internet package' then it isn't setup for Gaming AND Video at the same time, you would have to convince your mom to go to the next service package. For example if she is on the cheapo 5Mb Cable service, that is great for a couple of computers nothing else in the house and people can surf. If you want to Game while she watches Netflix without Netflix hiccuping / you not lagging, then you need at least the 15Mb Cable package. Normally because everyone's smart phones, iPads, Xbox's etc are ALL wanting to be online, most people are starting at the 30Mb package and going up to the 50-100Mb (depends on your area) service package.