Integrated Graphics Card not up to my expectations..

Your system isn't designed for gaming, no matter what tweaks you do, don't expect too much of an improvement. Integrated means it's on the mobo, there's no way for you to upgrade it unless you swap for another mobo, but those things you can't buy in retail. Parts for laptops are sold OEM. I would suggest try overclocking your graphics if possible, download ATItools or rivatuner and test if it's supported. Other performance increase consideration will be upgrading RAM, undervolting CPU (to some degree), and cooling pad if you want to overclock to near boundary. You'll also have to find the 'right' driver as mentioned, but again, it should not be that different in terms of performance.

Also, go to system and optimize Windows for performance, do the same for your graphics. It might help a bit.