Try GameBooster, google for it.
your RAM is too low, try buying 2x1gb or 2gb ram? reconmend kingston
try set all your setting in blackshot into low.
and if u have Intel HD Graphic, try set the (Performance --- Balanced --- Quality) to Performance.
srsly u need to get a new pc
Member of BSFT
Willing to help others who got problem with their hack
Please do not PM me for hack, as i will release it if i wanted to.