If that's how you delete programs, then it's no wonder you don't have much free space! Uninstall them with each app's uninstaller or Windows add/remove programs, don't just delete the folder they are in! You must have thousands of orphaned files left behind on that drive! Yipes! Use an app such as disk cleanup to get rid of the junk and you'll find you'll have GBs of free space, not MBs.