Very low on Disc Space

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i3 CPU M 380 @ 2.53GHz, Intel64 Family 6 Model 37 Stepping 5
Processor Count: 4
RAM: 3958 Mb
Graphics Card: ATI Mobility Radeon HD 5650, 1024 Mb
Hard Drives: C: Total - 461838 MB, Free - 401860 MB;
Motherboard: Dell Inc., 0XXMH9
Antivirus: PC Cleaner Pro, Updated: Yes, On-Demand Scanner: Disabled