Well, that is my experience :D. Using the Android File Manager to find the driver on the phone storage, still no luck for me. The driver is needed to use with PC Suite or to connect using ADB shell like when you install ClockworkMod recovery to your phone.
You can read here MyPhoneExplorer 1.8.2: PC Suite For Android Huawei U8100/U8120 if you want to download the driver from Huawei Official Sites that work with Huawei U8120 Android Smartphone or continue reading this article to use the default driver and PC Suite from Huawei U8120 phone.
This Huawei U8120 Default USB Driver and PC Suite was extracted from original Huawei U8120 phone with the same trick like my previous post Default Huawei U8100 USB Driver and PC Suite. This file is in .ISO format, so you need a software to mount the ISO file or extract it like Daemon Tools.
Huawei U8120 Default USB Driver and PC Suite Download link
Daemon Tools PRO ADVANCED 4.41.0315.0262
Default Huawei U8100 USB Driver and PC Suite
Upgrading your Phone to gingerbread ROM
MyPhoneExplorer 1.8.2: PC Suite For Android Huawei U8100/U8120
Install ClockworkMod recovery