This error often occurs when you are installing new driver (eg. V2.0 or above) while you have old driver installed (V1.0), and the old driver wouldn't get uninstalled.
Here is step-by-step procedure to uninstall your previous driver.
1. Locate your original driver CD where you would find "FLUSBVGA-1.1.329.EXE" (for example).
2. Copy the FLUSBVGA-1.1.329.EXE to C:\ .
3. Invoke cmd.exe with "administrator privilege". type "cd \", "dir FLUSBVGA*.EXE". You should see the file in the cmd window output.
4. type "FLUSBVGA-1.1.329.EXE /extract". You should see 2 msi files extracted. type "dir *.msi". The 32bit MSI file should look like this xxxxx.msi , while the 64bit msi should be xxxxx.x64.msi. The xxxxx denote random numbers.
5. If your OS is 64bit , type "msiexec.exe /x xxxxx.x64.msi". Otherwise type "msiexec.exe /x xxxxx.msi". At this step ,you should see uninstaller window shows up.
6 During step 5, you will be required to reboot your system. After that, you can install the latest driver.
If the above still fails, send us the step by step cmd.exe window screen dump (by ALT-PrintScreen Key, and save it to a bmp file).