I quote from the website:
Minimum recommended specs call for:
*
1 GHz 32-bit or 64-bit processor
*
1 GB of system memory
*
16 GB of available disk space
*
Support for DirectX 9 graphics with 128 MB memory (to enable the Aero theme)
*
DVD-R/W Drive
*
Internet access (to download the Beta and get updates)
Ok, I put the disc in my machine at 7pm. It finished installing at half past three (3:30am). The damn computer kept me awake and now Im really tired

My computer's spec:
1Gb RAM
1.5Ghz - 2.0Ghz Processor
I beleive I supplied it with a 80Gb hard drive.
It took 8 and a half hours.
My computer meets the reqirements.
Also another think to note is that with my spec, dont expect it to boot within 20 minutes.
as for the OS itself, I dont know... On boot, it crashes.
Routing through the Windows 7 source code I found:
OnComputerBoot()
{
CrashComputer()
return 1;
}No only joking, but you can imagine my frustration!

I think the error is graphical. The first time windows loaded, it loaded Aero then the graphics went all fuzzy, and now when I restart, it goes black and crashes when aero loads. I think my graphics card is too old? ATI Radeon 9550 (not sure what MB, probably 128)
On the whole, a complete bloody diasaster

(I might try and install it on this pc with Virtual Box!)
Tom