I tried many other ways to solve the problem but I always failled.

The problem is that even I did the 860x720 reg, the bot keeps says that I have to change
the screen to 860x 720. I am currently using Window 8 64bit. However the other computer(window 7 64bit)
the bot is working with no problems.

Thanks for the help so much.

Which reg did you use?
if the one from the bot.
go & dl the one I posted. It can be found in the cross bot thread.

Did the size of the bs window visible to you as 860x720 or it is bigger resolution after you applied the reg? Have you restart bs?
Try use autoit window info to see resolution of bs. Go under control to see Size. What is the reading.

After apply reg, restart bs. If can't, apply reg again and restart pc.

It depends on what version of BlueStacks your running. I found that the version I was running didn't reference what was in the reg file. Check the entries under
[HKEY_LOCAL_MACHINE\SOFTWARE\BlueStacks\Guests\Android\FrameBuffer\0]

If you see
Width
Height
You will need to adjust those entries to match the dwords on WindowWidth and WindowHeight. Or you can just copy the code below in notepad and save as all files to 860x720.reg.. Let me know if this worked for you.

[HKEY_LOCAL_MACHINE\SOFTWARE\BlueStacks\Guests\Android\FrameBuffer\0]
"Width"=dword:0000035C
"Height"=dword:000002D0
"GuestWidth"=dword:0000035C
"GuestHeight"=dword:000002D0
"Depth"=dword:00000010
"FullScreen"=dword:00000000
"WindowState"=dword:00000001
"HideBootProgress"=dword:00000001

It depends on what version of BlueStacks your running. I found that the version I was running didn't reference  what was in the reg file. Check the entries under
[HKEY_LOCAL_MACHINE\SOFTWARE\BlueStacks\Guests\Android\FrameBuffer\0]

If you see
Width
Height
You will need to adjust those entries to match the dwords on WindowWidth and WindowHeight. Or you can just copy the code below in notepad and save as all files to 860x720.reg.. Let me know if this worked for you.

[HKEY_LOCAL_MACHINE\SOFTWARE\BlueStacks\Guests\Android\FrameBuffer\0]
"Width"=dword:0000035C
"Height"=dword:000002D0
"GuestWidth"=dword:0000035C
"GuestHeight"=dword:000002D0
"Depth"=dword:00000010
"FullScreen"=dword:00000000
"WindowState"=dword:00000001
"HideBootProgress"=dword:00000001

Thank you for this. I installed an earlier version & rooted it. This was wracking my brain!