Are these games/programs that worked well before? If that's the case, then you more likely need to "fix" the issue, rather than "upgrade".
And what's the laptop model - many laptops cannot be easily upgraded.
Thanks Inanition02.No.it not worked well before.sometimes the games i play smoothly and sometimes it become lagging.my laptop model is ASUS A43T AMD A6-3400M with RADEON GRAPHICS HD 6720G2. so can you suggest how can i over come and upgrade this problems?