1. Close programs you aren't using if they are running in the background. You'll immediately free up enough space to save your files. Windows tasks your hard drive when you have programs running or multiple windows open. If this method does not work, attempt a save to an external drive.
2. Turn off your antivirus program and check whether your hard drive space increases. Most antivirus programs take up ample drive space, or they can negatively affect a computer's performance while updating. To see how much space your program uses, open your Control Panel. Acess your 'Add/Remove Programs' category and review the list of programs. Each program name includes the amount of allocated hard drive disk space. If the program is hogging your drive, consider purchasing an antivirus product, such as AVG, that utilizes less space.

3. Remove any spyware or adware by downloading removal software for free from a reputable website such as CastleCops. Use the 'Hijack This' application to create a snapshot of your system files for review by a technician. The pro will tell you how to hunt and remove any harmful files.
4. Empty your Recycle Bin. Remove programs and delete files that you no longer use, including temporary files and Internet cookies. Remove programs in the 'Add/Remove Programs' list.
5. Use ScanDisk to locate and fix any hard drive errors. If you cannot find ScanDisk, run a search from your Windows Help screen.
6. Defragment your hard drive. Defragmenting frees up hard drive disk space by bringing all of your data together in one place on the hard drive.
7. Buy a bigger internal or external hard drive if all else fails. Many inexpensive internal hard drives are available and are easy to swap. Match the new internal hard drive physical size to the existing one, so that it fits in your hard drive dock. Check your manufacturer's list of recommended drives. Most inexpensive external hard drives attach easily to computers with USB connectors.