Good evening Fiona, thanks for your captura, I only want to cry
It's correct this? I can choose between this 2 downloads:

I downloaded the "Windows 64-bits" althougth i don't understand what means "Use only on systems lacking WoW64 as some features are missing" It's correct that i downloaded the testdisk for 64 bit?
Then, I open it in my Computer downloads folder (it's correct then to run test disk in my computer "C:" disk?

and I have to open the file called: "testdisk_win"
it's correct? because when you say "is no necessity to run your windows explorer." then, where i must run it, in my external hard disk that i Can not open? Thanks Fiona for being here
Then When I open the testDisk, now only detect this 2 disk of teh computer and computer recovery, and testDisk doesn't detect the external hard disk called (B:)
but which disk are everyone if I only have this 3 disk? The DISK (B.) is the external hard disk that I want to recover
Can you help me please Fiona? perhaps it'sd better that i run testdisk version windows 32bits in another compyter that has Windows XP?