I narrowed down my problem towards the SYSWOW64 folder which I was unable to scan with Free TreeSize and WinDirStat.
Volume in drive C is Dem Windows
Volume Serial Number is 88E4-E300
Directory of C:\Windows
01/11/2014 07:33 PM <DIR> .
01/11/2014 07:33 PM <DIR> ..
10/27/2013 11:47 AM <DIR> .jagex_cache_32
07/13/2009 09:32 PM <DIR> addins
07/13/2009 07:20 PM <DIR> AppCompat
12/10/2013 03:57 AM <DIR> AppPatch
02/27/2013 10:08 AM 44,066 atiogl.xml
05/25/2013 11:27 AM 0 ativpsrm.bin
11/20/2010 05:24 AM 71,168 bfsvc.exe
07/13/2009 09:32 PM <DIR> Boot
07/13/2009 09:32 PM <DIR> Branding
06/29/2013 08:39 PM 38 camcodec100.ini
11/05/2012 07:06 PM 5,120 Cmicnfgp.ini.cfg
07/02/2013 07:36 PM 45,397 Cmicnfgp.ini.cfl
07/02/2013 07:36 PM 858 Cmicnfgp.ini.imi
03/07/2013 09:08 PM 5,874 cmudaxp.ini
07/13/2009 09:32 PM <DIR> Cursors
12/21/2013 05:09 PM <DIR> debug
07/13/2009 09:32 PM <DIR> diagnostics
02/08/2010 09:36 PM 519,048 difxapi.dll
07/13/2009 09:37 PM <DIR> DigitalLocker
12/25/2013 04:28 PM 16,921 DirectX.log
08/21/2013 07:35 PM <DIR> Downloaded Program Files
05/25/2013 10:08 PM <DIR> ehome
07/13/2009 09:37 PM <DIR> en-US
11/18/2013 09:22 PM 1,945 epplauncher.mif
02/24/2011 10:19 PM 2,871,808 explorer.exe
07/13/2009 05:39 PM 15,360 fveupdate.exe
07/13/2009 11:50 PM <DIR> Globalization
07/13/2009 09:37 PM <DIR> Help
01/11/2014 07:33 PM 0 Helpmenow.txt
07/13/2009 05:39 PM 733,696 HelpPane.exe
07/13/2009 05:39 PM 16,896 hh.exe
06/10/2009 12:30 PM 48,265 HomePremium.xml
07/13/2009 09:37 PM <DIR> IME
01/10/2014 07:56 PM <DIR> inf
11/05/2007 12:30 AM 1,144,983 KB936225x64.msu
07/13/2009 09:32 PM <DIR> L2Schemas
07/13/2009 06:34 PM <DIR> LiveKernelReports
12/28/2013 04:57 PM <DIR> Logs
12/27/2013 06:31 PM 600,382,868 MEMORY.DMP
07/13/2009 03:06 PM 43,131 mib.bin
12/16/2013 03:27 AM <DIR> Microsoft.NET
12/09/2013 11:15 PM <DIR> Migration
11/03/2013 08:17 PM <DIR> Minidump
07/13/2009 06:34 PM <DIR> ModemLogs
06/10/2009 12:36 PM 1,405 msdfmap.ini
07/13/2009 05:39 PM 193,536 notepad.exe
07/13/2009 09:32 PM <DIR> Offline Web Pages
12/21/2013 12:21 PM <DIR> Panther
12/09/2013 06:38 PM <DIR> PCHEALTH
07/13/2009 09:32 PM <DIR> Performance
01/10/2014 06:30 AM 10,058 PFRO.log
07/13/2009 07:20 PM <DIR> PLA
12/21/2013 01:03 AM <DIR> PolicyDefinitions
01/07/2014 07:11 PM <DIR> Prefetch
07/08/2013 02:38 PM 31 progress
07/13/2009 05:39 PM 427,008 regedit.exe
07/13/2009 07:20 PM <DIR> Registration
12/24/2013 06:25 PM <DIR> rescache
06/22/2013 11:10 PM <DIR> Resources
05/25/2012 05:06 PM 1,706,640 RtlExUpd.dll
07/13/2009 06:35 PM <DIR> SchCache
07/13/2009 09:32 PM <DIR> schemas
07/13/2009 07:20 PM <DIR> security
07/13/2009 08:45 PM <DIR> ServiceProfiles
05/25/2013 10:08 PM <DIR> servicing
07/13/2009 08:45 PM <DIR> Setup
01/11/2014 06:03 PM 3,046 setupact.log
12/21/2013 05:09 PM 0 setuperr.log
12/09/2013 06:37 PM <DIR> ShellNew
12/21/2013 05:15 PM <DIR> SoftwareDistribution
07/13/2009 09:37 PM <DIR> Speech
02/10/2012 10:36 PM 67,072 splwow64.exe
06/10/2009 12:31 PM 48,201 Starter.xml
10/27/2013 11:30 AM <DIR> Sun
07/27/2013 08:59 AM <DIR> system
06/10/2009 01:08 PM 219 system.ini
01/10/2014 07:56 PM <DIR> System32
01/11/2014 06:06 PM <DIR> SysWOW64
07/13/2009 08:57 PM <DIR> TAPI
05/27/2013 10:17 PM <DIR> Tasks
01/11/2014 07:26 PM <DIR> Temp
10/10/2013 05:15 AM <DIR> Temp392AAE3C-660C-47F7-251B-6A3888C1563B-Signatures
07/13/2009 06:34 PM <DIR> tracing
06/10/2009 01:41 PM 94,784 twain.dll
07/13/2009 09:32 PM <DIR> twain_32
11/20/2010 04:21 AM 51,200 twain_32.dll
06/10/2009 01:41 PM 49,680 twunk_16.exe
07/13/2009 05:14 PM 31,232 twunk_32.exe
07/13/2009 07:20 PM <DIR> Vss
07/13/2009 09:32 PM <DIR> Web
07/13/2009 09:09 PM 403 win.ini
01/11/2014 07:24 PM 1,244,582 WindowsUpdate.log
07/13/2009 05:14 PM 9,728 winhlp32.exe
12/21/2013 11:15 AM <DIR> winsxs
06/10/2009 12:52 PM 316,640 WMSysPr9.prx
08/17/2013 06:38 PM 193 WORDPAD.INI
07/13/2009 05:39 PM 10,240 write.exe
10/10/2010 11:00 AM 55,438 Xonar Audio.ico
02/14/2011 05:23 PM 15,086 Xonar Audio2.ico
04/12/2007 05:35 PM 40,358 Xonar DG Audio.ico
44 File(s) 610,344,222 bytes
58 Dir(s) 2,749,718,528 bytes free