It seems I'm running out of disk space in the C: drive. I have a Dell Optiplex 760, Dual-Partitioned tower using Windows 7 Pro OS and 64-bit. Other than removing any unnecessary programs, using CCleaner, SmartDefrag and TFC, is there ANYTHING else I can do to significantly reduce the amount of space in my C: drive? Already, I'm starting to see that the system is slowing down. Are there items in the C: drive, downloaded files, program files, etc. that can be removed to free up some space? (And, if that be the case, is there a simple way to determine whether a file can be removed or whether it can't be without adversely affecting the system?)
Attached are screenshots (2) of both C: and E: drives.
Thank you anyone who can participate with some suggestions.