http://www.gigabyte.com.tw/MotherBoa...s_GA-7IXE.htm#
There is no way it could overclock to 2Ghz or even get a 2Ghz cpu to run fast enough, doesn't even support the athlon XP.
So if you feel you can afford it, you will have to buy a new mobo/cpu/ram to get anymore speed out of your computer, sadly it can't reach much higher even if you were to OC and evertyhing such as memory, bus, slot a would all be a bottle neck in this case.
Only way would be to upgrade unless you will have to hold out for extra money, 100mhz might be the max you can achieve with it and it will not be a huge boost assuming it does go up that high.
While you do appear to be above the minumum requirements for dvd burning and ripping, upgrading might be for the best, just make sure your psu can handle it tho. Over 320w should be ok.