Start Up Disc Full Message

hi all,

keep getting message on mac. novice computer user. basics, email, itunes, facebook, , online classes. extent of computer usage. keep getting message on computer says, "your mac os x startup disc has no more space available application memory. avoid problems computer, quit applications not using. close windows , removing files start disk help." list applications open.

so, close out of applications , in 5 minutes message comes back. don't know next. please me!

 

how free hard drive space have (it's shown @ bottom of finder window when system drive selected)

if it's full, you'll have remove files osx has enough space run

 

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