Boot selection failed (trying to reinstall OS from USB)

Hi guys, I have just registered with this community because I am at my wits end with my pc and need some genius's to assist me...

I hope I am posting in the correct section - (it's difficult to know if it should be in hardware section or here)

Here is the back story.

My PC had a single hard drive with 300Gig. (I will refer to it as original HD64)
Windows 7 Ultimate 64 bit installed.
Worked fine for a year or two.
Eventually started crashing randomly, attempted lots of fixes but was reliably informed that it could be my hard drive.

I decided I would be best with a new HDD and a fresh install.
Bought a new hard drive. 250Gig (Will refer to it as new HD32)

Unplugged originalHD64 from sata cable and power.
Plugged in newHD32 into sata cable.

Inserted bootable USB flash drive with windows 7 Ultimate 32 bit on it.
Went through full install including partition creation etc.
Install crashed part way through but I think the dog knocked the power lead.
Restarted install.
Everything seemed to install fine.

Plugged in original HD64 into second sata slot.
Changed boot priority to New HD32.
Booted fine.
Clicked on >Computer and found new HD32 as C: drive and Old HD64 as D: as I wanted it to be.

So far so good.

But on next boot the CHKDSK thing ran. Then it booted ok.
CHKDSK ran on next boot also.

Then I managed too boot normally but realised there were a couple of things not working properly in the fresh install. Things like Windows Picture viewer would not open anything at all and a couple of other issues. And it was especially annoying that CHKDSK kept running. I asked for advice and was told that I should probably just format the new HD32 and resintall from fresh incase the install had somehow gone wrong.

So. I changed the boot order to Old HD64 and logged into my old windows OS which I had left installed in case anything went wrong.
From there I navigated to disk management and formatted and repartitioned the NEW HD32 disk.

Now I unplugged Old HD64.

Plugged in bootable USB flash drive and tried to follow the exact same steps as I followed last time. But instead of going through the windows install I just get
..."The boot selection failed because a required device is inaccessible" (and some other text viewable in the following link)

Here is an example image of the screen I get... The boot selection failed because a required device is inaccessible error 0xc000000f on HP Notebooks - Tricks Guide

So I reboot.
Press F8 to select boot device.
Choose USB flash drive.

Same issue.

I have unplugged the New HD32 and plugged in the old HD64 and done the same thing just to test if its a HD issue but I get the same problem.
I have now booted back to my OLD HD64 in order to come here and post my request for help!

I really hope somebody can assist me.

Thanks.

Thank you very much for your reply.
I presume the USB installation is ok as it is the same one that installed (almost perfectly) the day before.

I have used the boot menu to select usb flash but that is when I get the error screen.

Is there possibly some reason why my bios wont let me boot from usb now even though it worked the day before?

Thanks.

Hi, thanks again.

Ok - I have just been into my bios and in the boot order settings - usb is not an option.
All I have is one SATA and CD/dvd and Floppy.

I went into usb settings and enabled usb leagcy. (it was previously set to auto I think)
Still does not do it. Same error screen.
By the way USB flash drive does appear as an option if I press F8 on boot.
(The computer is a good 5 years old.)

However, what I cannot understand is that it did boot from the usb in the expected way a couple of days ago. All I have done is format the HD and try the exact same procedure again. (As far as I know)

I can go to COMPUTER and browse the contents of the USB drive.

Is there a way I can make sure the USB drive is definitely bootable in case something went wrong with it? Does it have to contain certain files?

Install crashed part way through but I think the dog knocked the power lead.

Check your PSU & Power cables, also check for dog hairs inside the case.

Where did you get Win7? Use Universal USB Installer for easiest method to write reliably to USB stick.

Unplug the new HD and check the old HD with maker's HD Diagnostic extended CD scan, and Disk Check with all handles run from installer's System Recovery Options Command Line.

Hi thanks for the responses.

I booted into OLD HD windows. Plugged in USB flash drive. Message came up asking if I want to auto fix errors. Clicked yes.

I unplugged the OLD HD.

Re-seated the NEW HD.

Plugged in usb flash.

Booted.

Pressed f8. Selected USB FLASH.

Install worked all the way through.

Thanks anyway.

In the boot.ini of the bootable usb, is possible are this:

multi(0)disk(0)cdrom(0)

How is a USB, change to:

multi(0)disk(0)rdisk(0)partition(1)

I not understand how this solution not is write in nothing site, and are many topics in forums about this error in bootable usb's...