How Can I Free Up Disk Space?

-I've had this desktop for years, and just today I realized that out of the 177GB I only had a few MB left. I did a Disc Cleanup and that freed up 13gb, but that's still not enough. Should I compress old files? Or defragment the disk? Or is there a program I should download? Please Help!there is not any such software as your requirement nor disk defragment and other task meet our target.compressing may some help you but as you have quoted it will also not helpful for you.

the best is to backup the data in portable disk drive and free up your hdd of desktop.
Back everything important on to an external hard drive and factory restore, you will be amazed at the amount of free space you will have.