-Please Help Me- NO miners work for me!!!!! Cant figure it out

[blitz555]

Hello, I am currently using Phoenix miner. Ive tried two pools (Slush's and BTCGuild) Everytime I mine EVERY share gets rejected. I have a really fast and expensive computer. My video card is AMD radeon 5800 (Crossfire can be enabled) I get 256ghas/s so I dont understand why every share is being rejected. Here is my phoenix log file:
[01/20/2014 14:53:02] Welcome to Phoenix v2.0.0
[01/20/2014 14:53:04] Connected to server
[01/20/2014 14:53:04] Server gave new work; passing to WorkQueue
[01/20/2014 14:53:04] New block (WorkQueue)
[01/20/2014 14:53:11] [cl:0:1] Result cb1063bc REJECTED
[01/20/2014 14:53:15] [cl:0:1] Result 7d181f39 REJECTED
[01/20/2014 14:53:34] [cl:0:1] Result c54072f7 REJECTED
[01/20/2014 14:53:42] [cl:0:1] Result 5ad6eaec REJECTED
[01/20/2014 14:53:57] [cl:0:1] Result 4dcbff5a REJECTED
[01/20/2014 14:53:59] Server gave new work; passing to WorkQueue
[01/20/2014 14:54:09] [cl:0:1] Result 8fc941d3 REJECTED
[01/20/2014 14:54:32] [cl:0:1] Result ec88ebea REJECTED
[01/20/2014 14:54:54] Server gave new work; passing to WorkQueue
[01/20/2014 14:55:49] Server gave new work; passing to WorkQueue
[01/20/2014 14:55:58] [cl:0:1] Result 27902e72 REJECTED
[01/20/2014 14:56:03] [cl:0:1] Result e663cd5d REJECTED
[01/20/2014 14:56:21] [cl:0:1] Result 72f9b3ed REJECTED
[01/20/2014 14:56:25] [cl:0:1] Result 890670fb REJECTED
[01/20/2014 14:56:36] [cl:0:1] Result 41d30dc7 REJECTED
[01/20/2014 14:56:37] [cl:0:1] Result 1563db7b REJECTED

This is all that happens all the time no matter how long I leave it running:( is there a miner I can use that just uses my video card? Or any solutions to this problem?

[1714046931]

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[studio1one]

are you mining Scrypt or SHA?

I assume scrypt as you are GPU mining

256 Gh/S? from a GPU? on Scypt?

no chance

are you using CGMiner by any chance?

and if so have you set it to Scrypt instead of SHA?

[studio1one]

Dun 

you are using phoenix miner zero reading comprehension points.

Never used it.

Something is wrong though, those speeds are well out of whack.

[Hexah]

Yep, 250 gh/s is way too much for you videocard.
On bitcoin wiki you can find a speed for you videocard.
Probably you should look into your miner. Phoenix is not that stable. Try to use cgminer or bfgminer.

[HellDiverUK]

Hello, I am currently using Phoenix miner.

There's your problem.  It's not 2011 any more.