Try reinstalling the phone's drivers, then delete everything related to them in registry or anywhere else on the computer, then make a clean install of them.
P.s. Yes, the rooting toolkit I recommended you works for many phones and manufacturers, not just e.g. the xperia z1 or our device. And sorry for the late answer. Just saw the thread here.
Phone: Sony xperia tipo (st21i)
Android version: 4.0.4
Kernel version: 3.0.8-perf user@PC2-desktop #1
Baseband version: 7x25A_M.2045.40.00.77.001.003_A:2045.40.00.77.002. 027
Build number: Gimlo v2.0