My ISP’s DNS, to put it politely, leaves a lot to be desired. I wanted to change them, but my network settings kept reverting. I’d change them, and they would change right back.
That pretty much made the fantastic DNSBench useless. I could find the fastest DNSs, but I couldn’t use them.At one point I thought it was Microsoft Security Essentials blocking the change, but nobody else reported that symptom, so I think that was just coincidence.
The solution is to completely reset TCP/IP. Either open a command line and follow Microsoft’s instructions, or click the little applet to let Microsoft do it for you. Then reboot.
Microsoft’s instructions are good, but they don’t go into much detail as to why you might need to do the procedure.
Theoretically at least, the same problems could happen in Vista and Windows 7 as well. The same fix would apply. If earlier versions of Windows break like this, you could remove TCP/IP and re-add it.
I’m happy to say now my PC is using the DNS settings I want.