HELP - Need to install Win 7 from External HDD (usb)

Here's my problem (Please read first)...

I had Win 7 Home 64bit installed, but I've been having loads of issues with it, crashes, dvd drive not working properly, and a reallllllly long blank screen after "Starting Windows" Screen (around 2-3 minutes)

After trying many, many different methods of fixing these issues, none of which did a darn thing.... I decided that I just needed to reload windows.

SO I reloaded windows from within the OS itself, (Not a Clean install) but that didn't fix my long boot problem. So I tried a clean install - I formatted the partition I wanted windows on (The same one it was on) and started the install only to get a screen that said I didn't have the proper driver for my DVD drive installed, WELL, it's an LG GH22LP20, and LG doesn't just give out drivers, NO they bundle them with Firmware so when I insert the DVD that came with the DVD Drive, it can't locate a driver for it! I looked online, I can't find anything except older Firmware/driver Software.

So now, my only choice is to use my External USB Hard Drive, so I created an ISO of my Win 7 Install Disk using IMGBURN onto my exHDD, BUT Now I get an error saying NTLDR is missing...

So.... Can anyone help?

Thanks all!
Aza

The OD driver error normally means you have a bad installer, as OD's don't have drivers anyway but use the SATA or IDE controller drivers. It can also mean a bad OD.

Confirm your ISO integrity and burn another DVD using ImgBurn at 4x speed with Verify.

if you've done this, then try install with flash stick which is much easier: Install UltraISO trial, on File menu open ISO or DVD, on Bootable Tab Write Disk Image, Format, Write. Boot stick under USB or HD's.

Reinstalling Windows 7

I don't have a Flash Drive, but can it still work with an External USB HDD?

Try this: Install Windows 7 From an External Hard Drive | PCWorld