You could try installing the drivers manually like this:
Download this extracted form of the exe file that you downloaded from their website.
Next, unzip it so you have an uncompressed folder.
Then, go to your device manager, and find the usb card.
Start=>Right-click "Computer"=>Manage=>left column:click "device manager"
I would put money on it being under the "sound, video, and game controllers" collection. Right-click the one you want, and choose "update driver software".
In the next box, choose "Browse my computer for driver software". Then click on the lower option, "Let me pick from a list of device drivers on my computer".
Next, it should show what type of device it is, but now you want to click the button "Have Disk". In the next "install from disk" window, click "Browse", and then browse to where you downloaded the extracted driver folder. Once inside, go to Drivers=>Driver=>WinVista=>Bin.
Once in that folder, there will be a file called "SB1095.inf", so choose it, then click OK. It then should recognize the file as part of the Sound Blaster Driver.
Click next and let it install.
Obviously, some things will different because of translation, but you should get the gist of where to go.