Solved How can i make/install windows 7 using my external hard drive ?

No, no. I did change boot device order even before I came here asking for help. I merely manually booted from the external HDD this time.

I cannot remove the entire HDD content, since it has multiple partitions that I cannot definitely remove.
 

My Computer My Computer

At a glance

Windows 7 Professional 32-bit
OS
Windows 7 Professional 32-bit

My Computer My Computer

At a glance

Microsoft Windows 7 Home Premium 64-bits 7601...Intel(R) Core(TM) i3 CPU M 370 @ 2.40GHz4,00 GBATI Mobility Radeon HD 5400 Series
Computer type
Laptop
Computer Manufacturer/Model Number
ACER ASPIRE 5742G
OS
Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
CPU
Intel(R) Core(TM) i3 CPU M 370 @ 2.40GHz
Motherboard
Acer Aspire 5742G
Memory
4,00 GB
Graphics Card(s)
ATI Mobility Radeon HD 5400 Series
Sound Card
(1) AMD High Definition Audio Device (2) Realtek High Defi
Screen Resolution
1366 x 768 x 32 bits (4294967296 colors) @ 60 Hz
Hard Drives
WDC WD5000BEVT-22ZAT0
If this isn't to your liking then you'll need to buy or borrow a 4gb flash stick ($5 with free shipping on buy.com) to write the ISO to it using Universal USB Installer with Win7 in dropdown menu. You'll need it for repairs anyway.

Three days ago I gave the easiest method to do this and warned repeatedly that trying to install from external HD is a can of worms.

Since that time there have been pages of Command Line code posted which chases away all but the most experienced users (including the OP). I fear this mess is going to represent this forum's help quality in Google searches.

If the Universal USB Installer won't write the ISO to your external, get a stick.
 
If this isn't to your liking then you'll need to buy or borrow a 4gb flash stick ($5 with free shipping on buy.com) to write the ISO to it using Universal USB Installer with Win7 in dropdown menu. You'll need it for repairs anyway.

Three days ago I gave the easiest method to do this and warned repeatedly that trying to install from external HD is a can of worms.

Since that time there have been pages of Command Line code posted which chases away all but the most experienced users. I fear this mess is going to be representing this forum's help quality in Google searches.

If you are ready to listen now: buy as $5 4gb flash stick and write the ISO to it in five minutes using Universal USB Installer

I couldn't agree more.

I used the tutorial to help me create a universal installer on a 6GB flash drive and used it to install Windows 7 SP1 in roughly 30 minutes.
 

My Computer My Computer

At a glance

Windows 7 Ultimate SP1 64-BitIntel Core i7 870 @ 2.93GHz8Gb Dual-Channel DDR3 @ 664MHznVidia GeForce GTX 460 1024MB dedicated RAM
Computer Manufacturer/Model Number
HP Pavilion Elite 495UK
OS
Windows 7 Ultimate SP1 64-Bit
CPU
Intel Core i7 870 @ 2.93GHz
Motherboard
MSI 2A9C (CPU1)
Memory
8Gb Dual-Channel DDR3 @ 664MHz
Graphics Card(s)
nVidia GeForce GTX 460 1024MB dedicated RAM
Sound Card
Realtek HD Audio
Monitor(s) Displays
HP2310i
Screen Resolution
1920 x 1080
Hard Drives
1x1954GB Hitachi HDS22020ALA 330 (RAID), 1x1954GB Hitachi External for backup and storage
PSU
460W
Case
HP Elite
Cooling
Air cooled
Keyboard
Logitech K750 solar-powered keyboard
Mouse
Logitech Wireless M180 mouse
Internet Speed
2Mb
Other Info
Pure Avanti Flow Internet Radio with iPod Dock, 64Gb iPod, HP USB Speakers, Sony MDR-V500 Headphones, Sony Vaio F-Series Laptop
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