my computer have 2.5gb ram ddr2 but it show usable only 510 mb ..why..it is showing less ram usable..

[partap]

Pls tell me the solution to use more usable ram..

 

[xidiliar]

The operating system and other programs you have running are using about 2GB so you only have 510MB left. If you want to free up some more RAM close some programs.