Not going to happen. Almost positive that Lenovo is like any of the other computer manufacturers (Dell, HP, etc) in that they remove/hide any and all options in the bios that would allow for overclocking.
Another thing to consider is that you don't really have a desktop,
Computer type PC/Desktop System Manufacturer/Model Number Me OS Win 7 Ultimate x64 CPU FX-8350 @ 4.6 GHz so far Motherboard Asus M5A97 EVO Memory 2x2 GB Kingston HyperX DDR3 1600 Graphics Card Sapphire HD 6850 Sound Card Xonar DGX w/ Corsair Vengence 1300 Monitor(s) Displays Acer S232HL Abid Screen Resolution 1920x1080
Keyboard Logitech G510 Mouse Logitech G500s PSU Antec Earthwatts 650W Green Case Antec Three Hundred Cooling Cooler Master 212 EVO Hard Drives 120 GB OCZ Vertex 3
500 GB Seagate 7200.12 Internet Speed 35000/3000