My hard disk drive shows I have 4.57GB Free and 31.6 GB TOTAL.Please what does tell meis it good or bad.?

LOL. your hard drive is where you store files ie. songs movies documents ect. Lets say you had a 50gb hard drive and you wanted to store 200 songs (let's say that's 1gb) you would have 49gb left free to store files as 1gb would be storing songs. The Total memory is the empty capacity of your drive and the available memory is how many gb of memory is currently available in addition to what you are already storing. If you want more memory delete some files