Wait it does ? Where is teh dvr ?
windows 10 has recording built in
pressing windows+g will bring up the game toolbar, if it's not recognized as a game you can tell it to think it's a game (like the browser, if you want to record that)
pressing windows+alt+g will record the last 30 seconds by default (it records in the background and then saves it)
pressing windows+alt+r will toggle recording on/off
using the windows+g menu, you can go to its options and change its settings (how long it'll max record, how long windows+alt+g will record (I have mine at 1 min), if it captures audio, if it captures mic)