Hello simontodd, welcome to Seven Forums!
You need to completely wipe the entire Hard Disk Drive you want to install Windows 7 to, have a look at the information and the tutorials at the links below and be sure to post back with any further questions you may have and to keep us informed.
After you have copied out
or made back-ups
of the data you need to save to external media, use Step One of this tutorial at the link below to do a wipe (secure erase
) to the entire Hard Disk Drive / Solid State Drive.
- Then if you do not want to create the new Windows 7 "System Reserved" partition use the outline in Step Two #2 to create, format and mark Active a single 100GB partition to do the installation to.
- If you do want to create the "System Reserved" partition use the outline in Step Two #3 to create, format and mark Active the System Reserved partition and then create and format the 100GB partition to do the installation to.
Either way, running the "clean all" then creating and formatting the partition(s) using diskpart will get you the best possible space to do a clean install
of Windows 7 to; you can always extend
the Windows partition to include the remaining unallocated space on the HDD / SSD or create
additional partitions after the installation completes if you choose. SSD / HDD : Optimize for Windows Reinstallation DISKPART : At PC Startup