https://sampforum.blast.hk/showthread.php?tid=176631 I only get an .pwn How to install it? //Thank you

I have windows xp 64x (bit) And it has an amd athlon x4 640 And radeaon hd 4650. I play san andreas online and after a couple mins it has bigg lagg. And on my other pc (dual core) and it runs smoothl...