Beamer, when migrating from one version to another..... it' s ALL about the drivers! Identify all the hardware that is specific to your machine, Sound, video, wireless, network, printer, camera, you know all that stuff that goes into it that might need a vendor specific driver to operate properly.
Download the drivers and put them all in a specific folder on a thumb drive labeled something like; "Win7ToshibaDrivers" or what ever your brand is.
Get the Microsoft certified drivers for the version of Windows that you are moving to... from Microsoft if at all possible.
That way when your PC "wakes up" hunting down the periphals and you get that darn "driver not found, installation failed" message you can just point it at the repository you made and it can gather what it is looking for from there.
Use the Windows Migration Tool (it is part of windows and should already be in your running system, OR get it while you are at Microsoft rounding up drivers)!!!!! All of your old files, documents, music, stories ,photos, backgrounds, network settings, and personal preferences will be seamlessly transferred to your new installation in the proper locations so you can find them easily. AND backup all of the above to external media (portable drive or DVD) before you start the process just in case that "Murphy" fellah decides to visit your house while you are in the middle of this. This is what the cloud was meant for!
Have at hand all of the Installation discs for any "outside" software you run. Those that the migration tool don't move for you may have to be reinstalled, there is usually some legacy support for older programs, but once in awhile something just won't run right in the new version. Use the 32bit install version for the older machines especially single core processors or those with 2Gb or less RAM, 64bit needs more overhead.
Brace yourself for a few hours of automatic updates unless the upgrade you have is fully patched... and even then there will be some. So pop a cold one (or 6) and vatch der blinkin lites.
Take care All;
Doug
"what is this quintessence of dust?" - Shakespeare