New
#11
Why would you be installing SP1 if you just reinstalled? Use the latest official Installer with SP1 and Media Refresh (thousands of extra drivers) during any reinstall.
Compare the reinstall you did 3 weeks ago with these same steps to get a perfect Clean Reinstall - Factory OEM Windows 7. If it varied by much I would do it over using only the tools and methods given which will assure you get and keep a perfect install as long as you stick with them