WinXP/7 ZTE Blade drivers and ADB - Android @ MoDaCo: "IF NEW HARDWARE WIZARD DOES NOT START.
1. Open device manager and right click on The exclamation (Think it says HSUSB?)
2. Select Update driver
3. When asked to search select no and browse to the folder where you extracted the files. Select next and driver will be installed.
4. Repeat step 3 for the other HSUSB device with exclamation.
5. Reboot into bootloader, rinse and repeat."