Need a suggestion!

[doken1313]

Hello experts. I need a suggestion please as I was away for about a year from bitcoin mining. I am having a windows 7 x64 pc and an Ati radeon HD 5770 gpu. I am trying to mine bitcoins @ BTCguild pool with no success. I tried cgminer all previous version that (as I've read in here) still support gpu mining but I didn't make it. I also tried this bfgminer but didn't succeed either.
I also tried some other miners that I used to use in the past, but no one seems to work for me. So can someone please enlighten me?

P.S. With every miner I tried the problem seems to be that no one of them identifies my GPU. (no device detected etc.)