hard drive or memory?

i hate to sound like a noob but well umm i am still learning .
i have alot of games but only so much space on my hard drive i also do movies and music what i am wondering do they all have to go on your hard drive?can you dl games to your memory?
i guess what i am saying is i need more room on my hard drive how can i get that without haveing to buy a new one or constantly dl and uninstalling games so that i can play another or store music and movies without useing all my harddrive space?will they function from a different location?how does that work?
point and i will read just need to know where and what to read so this dummy can get better performace out of what his cheap arse has
ty in advance for the info!

example: i do guild wars online it is a big program if i dl alil music and another game (call of duty 2) and then see a movie i might want to duplicate : i have to unistall something to make room for back up?

it is a real pain in my rear and i really want to figure out what i am doing wrong?

 

the best bet would be to get another hard drive whether internal or external. Otherwise you could burn music to cd's so they dont clutter up the hard drive. you could also clean up the hard drive and get rid of old stuff you dont want or need and defrag it. you cant install stuff into ram, ram is what your system uses to operate . hope that helps