[Q] Computer fails trying to unlock bootloader of R800i

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Hello,
I'm trying to unlock the bootloader of my R800i, and every time I plug it into my computer while holding the search button on the phone, the "Point to drivers" window doesn't pop up on my computer.
I've followed everything on Sony Mobile's site, my R800i says bootloader unlockable Yes in the service menu.
Baseband is -56 version
Build number is 4.0.2.A.0.42.
I've got the Android SDK, the modified winusb.inf file, and google USB Rev. 4.
My computer is using Windows 8 Consumer Preview if that means anything.
I've tried searching google and here on xda, but I can't seem to find a thread about the computer failing in the unlock BL process.
Is it operator error (probably), or is it something else?

Install flashtool from here.

Once it's installed, go to the Drivers folder (I think that's what it's called) and install the exe file in there. Then just select the drivers in the list for R800, ADB and fastboot.

It should install them automatically.

EDIT: I do remember seeing something about Windows 8 compatibility issues but I can't seem to find it now and I can't quite remember what wasn't compatible :/

Alrighty, thanks. Will do when I get the chance this afternoon

EDIT: I just installed flashtool, installed the drivers you specified, and it says that everything is fine. However, when I plug my phone into my computer red text comes up in flashtool saying "ERROR - Drivers need to be installed for connected device." and that I can find them in the drivers folder of flashtool.
Not sure what's going wrong here, so any help is really appreciated!

Ok, I think I have it figured out, but I'm only running on a hunch; do I have to be on version 2.3.3? My play is on the latest 2.3.4 release.

You shouldn't have any type of problem with 2.3.4.

If you entered "fastboot.exe -i 0x0fce getvar version" and you still got no response then you still have a driver problem.

I had the exact same problem!

Its because Windows 8 doesnt install unsigned drivers as its still in Beta.

I had to re-install Windows 7 on my Computer, which took forever, so my advice is use a different Computer to do it. Saves the hassle of Installing Windows 7

Sent from my R800i using xda premium

Ahhh thank you so much AwaisKhan!

Originally Posted by TFEDSDB

Ahhh thank you so much AwaisKhan!

Your welcome!

Sent from my R800i using xda premium