It took me a long time to find a really reliable VPN that works for Windows, to be honest. A lot of VPNs keep giving false promises. I used to try free VPNs until my friend recommended Astrill. It's a paid VPN but it keeps my browsing activity secured. Apart from that, it doesn't compromise my internet speed, too. I'm still looking for better VPN but so far, Astrill is the one that works for me best. I'm using Windows 10, btw.