I shouldn't have to struggle to find out which OS you are using, but I found it in the thread "Z3100 new driver/firmware" started by Roscolo on July 19, 2010. I note that you have posted in that thread and that I noted a lack of success with that driver.
However, if you had Googled the phrase "error 2 running command" you would have found that the problem is in the Unzip program you are using, specifically:
"An Error 2 running command xx message usually indicates that path information in the original Zip file was not entered in the command to issue. Please note that a self-extracting Zip file uses whatever directory structure is stored in the original Zip file. If you create your Zip file with path information unintentionally, the result would be files extracted to a subdirectory of the expected location."
Try again and look closely for the correct directory.
If you can get that driver working on Win7-64, please report back to the group as there is mixed success with it, even once it gets installed.