1. Go to Start\All Programs\Accessories\System Tools\Disk Cleanup
2. Choose the drive you want to clean up e.g. C and Click ok
3. Diskcleanup will scan your disk and list all the unnecessary files that you can delete.
4. It will tell you how much space you can recover by removing the files
5. You just need to select the checkbox next to the files you want to remove.
6. It will tell you how much space they are taking up and if you click the filename it will give a description of what the files do and tell you if it’s safe to delete them.
Last time I ran Diskcleanup I deleted nearly 20GB of useless temp files from a 500GB HDD
Once you’ve removed all those files you can remove any installed programs that you don’t use anymore.
1. Click the “More Options” tab and then under Installed programs, click Clean up.
2. The Add or Remove Programs dialog box is displayed.
3. In the Currently installed programs list, click the program that you want to remove, and then click Remove (or Change/Remove).
4. If you receive a prompt to confirm the removal of the program, click Yes.
5. Repeat step 3 and 4 to remove other programs that you no longer use, and then Click Close.
6. Click OK,
7. Click Yes to proceed with this action, and then click OK.
Now you can see how much space you are left with. If you need more space then try running disk Cleanup again, there may be other unnecessary files it finds, now that you have removed some of the programs.