Graphics set to very low? If yes, maybe adding 2 gb ram helps.
But if you have constant lag take a look at your internet connection. Some are just too slow to handle online games.
Do other online games cause the same problems?
If you use an anti-virus programme sometimes setting eso. exe as allowed program helps reducing lags.
(But please just eso.exe / eso64.exe)
Don't leave but get yourself a new PC, actually desktop with i5, 8GB, GTX660Ti is getting cheap and is decent for playing ESO on high settings.
Playing ESO on low settings is such a waste - you miss all the fun coming from clear HD resolution and effects .
PC EU (PL): 14 characters. ESO player since 06.08.2015. Farkas finest quote: "Some people don't think I'm smart. Those people get my fist. But you, I like."