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one more question can i mine bern coin with diffrent softwares like 1st with minerd.exe and 2nd with cpuminer.exe with same PC/laptop
minerd and cpuminer are both CPU miners. Running both at the same time on the same machine would not be advisable. Test to see which performs better and stick with that one. FYI, the minerd that is bundled with the BERN wallet is actually the 32 bit version of https://github.com/tpruvot/cpuminer-multi and, of course, used with his permission.
I do CPU mine and GPU mine at the same time with 1 machine. On a different machine, CPU mining slows my GPU mining down by a greater factor, so it is not advantageous to do so on that machine. You will have to experiment and watch your results. Sgminer is what I use for GPU mining, as I have AMD GPUs.