This is a known problem across all Linux distros. Bug report.
You'll need to blacklist the original module, and then install the driver downloaded from Realtek.com.
Run gksu gedit /etc/modprobe.d/blacklist.conf, and add the following to the bottom:
Reboot, and make sure that no rtl81** modules are loaded with lsmod | grep 81
Place the downloaded file in your home folder, and run
3. If you have any questions, do not hesitate to ask.
unzip RTL8192xC_USB_linux_v3.4.4_4749.20121105.zip #extracting
sudo bash ./RTL8188C_8192C_USB_linux_v3.4.4_4749.20121105/install.sh