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Windows 7: Formatting C but C doesn't get cleaned

13 Sep 2013   #1

windows 7 ultimate x64
Formatting C but C doesn't get cleaned

Usually when I format my computer I install windows 7 on C so C gets cleaned, all programs and viruses removed but when I tried to do the same yesterday C still had all of it's files on windows.old so I am afraid that the formatting was ineffective and the viruses are still around.

When I entered windows.old I have found that it contained all of the previous files, also steam did not get deleted or moved at all. It stayed in C even after the formatting.

What am I doing wrong?

My System SpecsSystem Spec
13 Sep 2013   #2
Microsoft MVP

Windows 7 Ult. x64


You havent formatted before installation. Use this guide to reinstall and pay close attention to steps 6, 7 and 8.

Clean Install Windows 7

My System SpecsSystem Spec
13 Sep 2013   #3

windows 7 ultimate x64

The hard drive is not "unallocated", it has 16 GB out of 106 available GB.

I did use custom (advanced) install but not drive options (advanced).

What is my mistake?

I currently have 2 hard drives, C and D with C having 106 GB and D 230 GB and I want C to be cleaned having all viruses there removed
My System SpecsSystem Spec

13 Sep 2013   #4
Microsoft MVP

Windows 7 Ult. x64

You need to delete the existing partition/s......see steps 6, 7 and 8 in the tutorial.
My System SpecsSystem Spec
13 Sep 2013   #5

windows 7 ultimate x64

Alright, drive custom and choose delete or should I choose format?

As far as I understand I use drive custom options, choose delete, select unallocated hard drive space and it will turn into C.

Am I correct?
My System SpecsSystem Spec
13 Sep 2013   #6

windows 7 ultimate x64

Saw a video of a person formatting his computer, he deleted C, installed windows 7 on it and it worked fine.

If I do the same the unallocated drive will become C? I ask this because I currently have 2 hard drives
My System SpecsSystem Spec
13 Sep 2013   #7

Microsoft Community Contributor Award Recipient


First remove HDD 2.

To clean install:
1) Clean the HD Drive, using Step one in this tutorial:
SSD / HDD : Optimize for Windows Reinstallation
2a) clean install with the OEM manufacturer's Recovery Disk.
2b) Clean Install Windows 7
2c) UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with
My System SpecsSystem Spec
13 Sep 2013   #8
Microsoft MVP


Always unplug all other HD's, boot the installer, delete all partitions as suggested, then create and format new as you please, or just click Next to let installer create and format and begin install.

Other tips to get and keep a perfect install are the same as for Clean Reinstall - Factory OEM Windows 7 .
My System SpecsSystem Spec
14 Sep 2013   #9

windows 7 ultimate x64

So I
1) Take out my 2nd hard drive
2) Go into drive advanced options
3) Delete C
4) Install windows 7 on the unallocated hard drive space
5) Re-connect my 2nd hard drive

Will this clean C and keep F on the computer?
My System SpecsSystem Spec
14 Sep 2013   #10

Windows 7 Pro x64 Windows 10 Pro x64

Yes, but what is F ? Your dvd drive ?

You can choose delete or you can format the install partition ( in this case C ) either way it will remove the old operating system and any data you had on it.
My System SpecsSystem Spec

 Formatting C but C doesn't get cleaned

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