Communicate with PC at baud rate :115200 bps

[skimask]

Oky with PIC16f877a this give me an error because theses registers are not exist

And a quick look at the '877A datasheet, Table 10-3, would tell you that getting 115,200 baud out of 4 or 8 Mhz isn't going to happen, unless you can somehow magically get a divisor of 1.5 stuff into that byte value.
You need more crystals in your toolbox.
Actually, what you need is more variety...

[iugmoh]

ok what is the suitable PIC IC needed with crystal to achive this problem

[skimask]

ok what is the suitable PIC IC needed with crystal to achive this problem

FASTER...that's all...FASTER! Read the Tables and you'll see what I mean.
A serial link can tolerate X amount of error. So, find the combination of oscillator speeds and serial communication speeds that works for your unique situation.
I can't help you much more than that...I don't think anybody can...until you do some reading and comprehending the information involved.
The 16F877A will run at 20Mhz (possibly a bit faster), the 18Fxxxx series will run at 40Mhz (55Mhz in my experience, but not recommended for reliability). Either of those chips that you have been relating to in your threads will work just fine.
You need more crystals! More oscillators! More freq! More cycles per second! More HERTZ! More variances of direct current per unit of time!
That's all!