No not difficult.
You need:
A computer (I must be thorough!)
A Windows setup CD
A Windows key (that sticker with the long number on it)
And a working CD/DVD Drive (actually all hardware working ideally)
Then put the Windows CD in the drive
Reset your computer (you can even just press the reset button, since it's all just going anyway)
When you get the prompt "Press any key to boot from the disc" just press the space bar
Allow all the innitial Windows files to load up
At last you will be given the option to setup Windows
At this point, read all the writing, somewhere in the text it says press L to remove the partition(s)
Once all the Partion(s) are removed, don't create a new one
Just continue setting up Windows (Windows creates a single Partition NTFS for you)
Then follow the bouncing ball (note: there is no bouncing ball)
Once you at last get to the Desktop, start installing all your Drivers
Continue to install all Service Packs
All done
Except of course you still need Adobe and Office and all the rest