Default Help unlocking bootloader on SONY XPERIA ION

Simply there si not a THREAD that i didn`t saw about unlocking the bootloader on the XPERIA ION, i`m running windows 8.1 (YES I KNOW ABOUT WIN 8 and all the crap) I INSTALLED ALLL THE DRIVERS i could find so when i press the VOL down button and put the cable on my PC says "Cannot recognize.....blalbal" and then my phone goes to SONY Logo and switches to the charging logo so ANY HELP?!