Advice please!!! I'm a bit panicky at the moment

My main hard-drive (Hardrive "F") is...running out of disk space. I'm shaky, what if my computer get the blue screen of death now and I have to restart? With low disk space, can you restart without problems?
I think that it is partly because I have SO many pictures (and some videos, some of them long) stored on this drive. In fact, I am moving a BUNCH of them to drive G as we speak.
I even did disk space clean up, but it said that it cannot resolve the the low disk-space situation and that I have 0 megabites of space left.
Also, I have lots of games on this computer. I have another (older) computer than my next door neighbor gave to us that, and once my dad cleans it up (my friend says that the computer belonged to her brother, was died and he might have had some not-so-nice stuff on there) we'll move all our computer games to it that we can.
But besides that, do you have any advice for me to prevent low disk space in the future?

Shew! By removing a bunch of my pictures and just a few other things, I now have almost 5 gigabytes of hard-drive space.

Oh, and my dad is ordering a bigger hard drive for his computer soon and he'll give me two of his hard drives, which are way bigger than the ones on my computer. I can store my pictures on those and it would be forever until I started running out of space!

LOL ... you've been one extremely busy person this morning! Been there & done that ... now I have an extra hard drive, and I save my pics to a disk or to Flickr. Games aren't quite so much of an issue these days at our house since so much is online. BUT - it's absolutely amazing how quickly the hard drive can be filled up ... and it all happens while you're not looking and just having fun!

If you haven't done so, I highly recommend you make a copy of pictures/movies on a disk just in case - I lost almost 3 years worth of my pictures when my hard drive crashed. and I had no back up.

I was going to do that a long time ago, but never got around to it. I'll have to do that.
I lost most of my digital pictures from December 2006 once. I don't exactly know what happened to them.
I do have a Windows back-up thingy that is supposed to store everything on my computer, but I need another backup I guess.