You can just delete the line and save the file w/ notepad. It's just a simple text file, nothing fancy. If it makes you feel more comfortable, back up the hosts file before editing (e.g., hosts.bak).
Ugh, problem, when I deleted the lines and then saved it, it says access denied. Apparently I'm not allowed to save; even though I'm admin on this computer. >.< It asks if I would rather save to documents... What should I do?