I'm stuck in a quest and have been stuck for over a year.

I'm in a circular room and about 8 people throw spells at me and kill me in about half a minute.,

there is nowhere to hide,I've tried all the signs and none work.I try to get into close combat but that';s worse.
HEEELLLPPPPP.

I haven't played this game since 2011 because of this quest.
That makes it 2 years lol.


I just want to finish this game.

It a secondary quest, you don't actually have to finish it to complete the game.

But this tactic was recommended in the Witcher wikia:
[i]
You are forced to fight and kill both Cynthia and Adelbert who splits into three opponents. This fight can be quite a challenge, and it's not made any less frustrating by the fact that if you die, you'll have to go through all of the dialogue again. One tactic is to give whoever's about to attack--or simply closest--a nice hard Aard to the face: if your critical effect chances are high, there is a chance you'll get an instant kill. Moreover, don't bother attacking Cynthia when she looks like she's even considering teleporting, because she'll be entirely untouchable for an obscene number of frames, so while you're swinging away at her with mighty impotence, a number of Adelbert's projectiles are likely to have snuck up on you. At any rate, wearing a trophy that increases Vitality doesn't hurt, as your 4 enemies can whittle it down in a matter of seconds--also an excellent reason to constantly keep dodging no matter your build or gear or difficulty setting. [/i]

Also when I played this part I chose a dialoge option that lead me to fight with Cynthia against Adelbert, which made things much more easy.