So how 'bout ask some serious questions with some kind of structure & details?
Because "why cant i see enimies in cryodiil? i see myself being attaked but i dont see any enemy. why? " is a bit vague, and to this, I can only respond that it might be a bug. That's all.
You are not alone Some video refresh bug...if you /reloadui you will see them in a small area around you. Not sure how you fix it but after few restarts will work again.
ESO is based in a totally modified HERO engine correct? Swtor that uses HERO engine also, have that problem. Some times in the arenas, you dont see the enemies, but an invisible thing killing u (it dont happen always though).
why cant i see enimies in cryodiil? i see myself being attaked but i dont see any enemy. why?
Because you only have friends in Cyrodiil, of course .
On a more techy side off things.
Have you tried turning on/off VSync?
ATI or AMD for the gfx card? Latest driver, beta driver? Old stinky driver?
Have you tried changing the game's reolution (higher or lower).
Do you have anything overclocked on your rig?
Have you tried increasing/lowering your gfx settings?
Is the entire ESO folder added to the firewall's exceptions?
Single or multiple monitors? (if several, try with only one plugged in).
SLI/crossfire or not? Same thing with only one card?
Is the game ran as administrator?
for nividia - In the NVidia control panel, are the settings set to "application controlled"?
For ati - have you tried using a Nvidia card?
"In 2014, a possible bot was sent to coldharbour by a military GM for a crime she didn't commit. This argonian promptly escaped from a maximum security stockade to the Ebonheart underground. Today, still wanted by the developers she survive as soldiers of fortune. If you have a bot problem, if no one else can bite you, and if you can find her....maybe you can hire The SQUISHY."