Install Windows 7 with a USB Pen Drive. Need Help.

Okay, here’s the deal:
I got two PCs and one of them is BLUE SCREENED and I wanna format it since it’s clogged with virus.
1) I’ve already installed Win7 in my 8GB USB and it was a perfect transfer. I used Windows 7 USB DVD Download Tool to get things done.
2) I inserted the USB into the blue-screened computer. But, it tells me to SELECT A BOOT MEDIA PRESS A KEY thing. I used F2 to enter BIOS and it says the first choice of boot is the USB. This is the problem.
http://imageshack.us/photo/my-images/357/imgp0706il7.jpg/sr=1
How can I install Windows 7 with a Pen Drive? I already did everything I read when I googled but still, nothing. I really need help. Thanks.
Answer #1
The pen drive isn’t properly setup as a boot device. You did something wrong with that part.
Answer #2
How dated is the PC? Motherboard model? On the boot order,What options do you have exactly? List em all.
Usually,To install an OS from a flash drive,The BIOS has to support booting from a USB-HDD,Some very
old ones only support floppy drive emulation which is useless for this task. But of course I can’t say
for sure whether this is indeed the case,ajcis55 may have a point,Test it on your current PC and see if it boots.
Answer #3
Yep, If it’s an old PC then try it on a newer PC and see if it will boot.
I have trouble booting USB on my PC which is an old P4 and says USB-FDD as Roberto mentioned.
Some things like EASUS or Acronis boot disks or a basic DOS disk will work..
But I have not been able to get Hiren’s BootCD to work, no matter what USB converting app.I tried.
I think that sometimes that Windows download thing is a bit critical on the exact Windows ISO, so you might want to give Flashboot a try..
http://www.prime-expert.com/flashboot/
Or Win to Flash..
http://wintoflash.com/home/en/
Answer #4
When you installed it to the USB flash, it probably didnt make it a bootable device
Try using Flashboot (its also in the apps section) or WinToFlash as Nel suggested
Answer #5
Roberto400 replied: How dated is the PC? Motherboard model? On the boot order,What options do you have exactly? List em all.
Usually,To install an OS from a flash drive,The BIOS has to support booting from a USB-HDD,Some very
old ones only support floppy drive emulation which is useless for this task. But of course I can't say
for sure whether this is indeed the case,ajcis55 may have a point,Test it on your current PC and see if it boots.
it’s not too old… I’ve installed a windows before. But, now it’s not working.
NOTE: giving flashboot a try.