Well, if you planned properly you wouldn't have to. But assuming you haven't let's do it right this time.
1. Create a 128 GB C:\ partition on HD, install windows, do all the updates and driver installations.
2. Open Disk manager and create additional partitions ..... options include:
- - Temp File Partition - small partition for page and temp files; these are the things that have most impact on system responsiveness and it is therefore beneficial to have these always on outer portion of HD.
- - Games partition - assuming this is your most critical item ffor speed so we want these as close to the outer edge as possible
- - Programs partition - this takes 2nd priority to gaming I assume, if a work box, maybe you switch.
- - Data - This is where ya keep ya photos, homework, whatever
- - Backup - Keep an image backup of C:\ here as well as "important stuff".
3. Be careful to install stuff where ya want so it doesn't go into C:\ProgramFiles.
4. Now if you do a hardware upgrade or OS gets hosed or corrupted, just format C:\ and reinstall.
5. All ya games, programs , data all still there. For programs and some games, you will have to reinstall over themselves to set up registry entries.
I have seen peeps install new OS over old..... can't think of one who didn't eventually start over. But you can do this still.... just don't format C:\ and install new copy of Windows, it will re-establish most of what you had..... old stuff will be left in windows.old directory.
The activation won't notice if you use a very similar MoBo,.... same brand, same model is best but I have gong from an 1156 build to an 1155 without any Win7 activation issues.
If you built it yaself, then you as the system builder can install it on any other PC, it's yours. If you bough it from a system buillder, then the license is forever tied to the PC.
http://www.zdnet.com/how-the-new-windows-8-license-terms-affect-you_p2-7000003028/