HOW TO FREE THE RAM OR WHAT TO DO IF PC GETS HANG A LOT FOR WINDOWS XP , VISTA , 7

guys some time our pc gets hang sometimes we open large amount of files so it gets hand

the main problem here is the task bar

we have many items open when we start our pc
all we need to do work with the task manager
go in processes tab you will get something like this

now in process tab you will see many processes going on there just end the process by viewing the description but some are important if u end that computer will restart so be carefull some may won't have any description they are virus so scan your pc with good antivirus 

also disable some items which start when u come at desktop by going in RUN

type msconfig and disable all except antivirus

this will help for fast startup and all any problem please comment and thanks for reading