Diskpart error: Clean is not allowed on the disk...

silverAva

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6:18 AM
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Hi,
I am doing a clean windows 7 install *again* and I want to completely wipe off the hard disk this time, I followed this tutorial http://www.sevenforums.com/tutorials/52129-disk-clean-clean-all-diskpart-command.html but got this error:

tafk.jpg


Now what am I doing wrong? Help please!
 

My Computer My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
Dell XPS L502X
OS
Windows 7 Home Premium 64-bit
CPU
Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz
Motherboard
Dell Inc. 0NJT03
Memory
6.00 GB
Graphics Card(s)
(1)NVIDIA GeForce GT 540M (2)Intel(R) HD Graphics Family
Sound Card
(1)Realtek High Definition Audio (2)Intel(R) Display Audio
Antivirus
Bitdefender Internet Security
You can't clean the disk you are booted from. You need to do this from a booted Windows 7 install DVD or flash drive Command Prompt.
 

My Computer My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Lenovo IdeaCenter 450
OS
Windows 10 Pro X64
CPU
Intel Quad Core i7-4770 @ 3.4Ghz
Memory
16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
Graphics Card(s)
Intel Integrated HD Graphics
Sound Card
Realtek HD Audio
Monitor(s) Displays
HP 22" LCD
Screen Resolution
1680 x 1050
Hard Drives
250GB Samsung EVO SATA-3 SSD
2TB Seagate ST2000DM001 SATA-2
1.5TB Seagate ST3150041AS SATA
Keyboard
Dell USB
Mouse
Lenovo USB
Internet Speed
Cable via Road Runner 3MB Upload, 30MB Download
Antivirus
Windows Defender, MBAM Pro, MBAE
Browser
Seamonkey
Other Info
UEFI/GPT
PLDS DVD-RW DH16AERSH
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