You could try to install the software that can be found on Huawei's website.
Unfortunately I can't post any links, so I will describe how to get there.
-On Huawei's website, hover your mouse over 'support' in the upper menu bar, then click 'Downloads'.
-In the middle, the 'Manuals' tab is selected, click 'Software'.
-Now look for 'HUAWEI Android Phones USB Driver', probably listed at top.
After installing it, my phone got recognized in Win 7's device list.
Unfortunately I can't approach the SD cards, but that might be a different problem. (I am able to see 2 extra removable storage devices in explorer, but can't open them. A clue anyone?)