Thanks for the links olyteddy.
Despite being a Technet Plus subscriber, it has been a pain for downloading as it no longer uses the Microsoft File Transfer Manager, even in IE9. I've been trying to download Windows 7 x64 SP1 ISO and it kept failing midway (usually ~1GB downloaded) and also failed twice in Microsoft Download Manager, which was a recommended alternative to the File Transfer Manager going by posts on Technet forums.
I'm currently trying again with Free Download Manager, a download manager I use to use several years ago and it's so far gone much further than the other attempts. If this fails, I'll try a download from those links.
Edit: The Free Download Manager utility successfully downloaded the ISO from Technet. It got stuck twice, first time at 96% and again at 99% where it endlessly said "Starting..." I stopped and resumed the download and it continued and thankfully the SHA1 calculation with HashCalc matched that on Technet. Now time to try out the Microsoft's USB tool.
Edit 2: Either my USB flash drive doesn't support boot or the Dell PC I've tried on is picky about it, saying "A disk read error occured", so back to burning the trusty recordable DVD.