Generally speaking, any Linux driver on a vendor CD would be outdated, and, in most cases, would not be worth bothering with. The RTL8192cu module has been part of the Linux kernel since version 2.6.38, so that, ideally, you'd only need to plug the device in, and it would work. Unfortunately, that particular module hasn't ever worked, and, IMHO, a fix has been long overdue (bug report).
So, what should you do? Plug in the device. Verify that the network manager 'sees' the wireless networks around (may also verify that the correct module is loaded by running
lsmod | grep 8192). Try connecting to your network. If that doesn't work, try connecting to any network. If that doesn't work, you are affected by the bug, and will have to try the driver from http://www.realtek.com.
Download the driver from here, and put the downloaded file into your home folder.
Blacklist the existing module. In a terminal window, run
gksu gedit /etc/modprobe.d/blacklist.conf, add
blacklist rtl8192cu to the bottom,
save and exit, then reboot.
Extract the downloaded archive: right click, Extract here, or run
Install. In a terminal window, run
sudo bash ./RTL8188C_8192C_USB_linux_v3.4.4_4749.20121105/install.sh