Not helping much
It's all very well getting all snotty and telling people to use the search, but PLEASE keep your links up to date.
I have a problem with my Arc LT15i and am trying to unlock the boot loader. I have x64 Windows 8 and cannot get Windows to see the phone. ALL of the links I have found on the internet, here, at Sony Ericsson and any other place I have found are ALL dead links or try to foist some crapware on you.
I get the blue light on the phone indicating it is trying to enter Fastboot, but Windows will not see it, it appears as S1 Boot Fastboot in Device Manager, but no driver that I've found will work.
Flashtool may be very good, but it only works if you have an unlocked boot loader (according to Sony Ericsson).
If anyone has a Windows 8 64bit driver I'd really appreciate it if they'd pass on where to get it.