You'd need to wait
until retail installers with SP 1 come out to locate one to do a Repair Install unless you can uninstall SP1 - slipstreamed installers will not work.
But since you're running an inferior in-place Upgrade install anyway, why not bite the bullet and clean reinstall following these tips to get a perfect reinstall which you can then image so you never have to reinstall again:
Back up your files externally, make your Recovery Disks or save a Backup Image
of the entire HD first so you have a path back to factory condition.
Boot the Windows 7 installer, choose Custom Install, then Drive Options (Advanced) to delete all partitions not needed - save your Recovery partition if you can't make the disks or want to retain the most stable method to run Factory Recovery in the future.
If you delete all partitions to create New ones and format, the installer will issue a 100mb System Reserved boot partition which conveniently places the Repair Console
(normally only on the DVD or Repair CD) on the F8 Advanced Boot Tools menu. Partition as you wish and format before install following illustrated steps given here: Clean Install Windows 7
The installer is mostly driver
-complete, with newer arriving quickly via optional Windows Updates. Just in case, have your Wireless driver on flash stick or CD so you can get online quickly. Then enable hardware driver auto-updating
and check for optional Updates.
still missing in Device Manager can be found on the Support Downloads webpage for your model computer or device. Driver Install - Device Manager
Install updates and then programs slowly over time to gauge performance after each. Don't let any programs write themselves into msconfig>Startup as they slow startup, become freeloaders on your RAM/CPU and can spy on you. I only allow AV and gadgets. Startup Programs - Change
Use a lightweight free AV like MS Security Essentials which works perfectly with Windows 7 Firewall. http://www.microsoft.com/security_essentials/
When it is finished, clean and order the HD perfectly using state-of-the-art free CCleaner Disk and Registry tabs, then Puran boot-time defragger after adding it's Intelligent Optimizer on Additional Operations tab. CCleaner - Free software downloads and software reviews - CNET Download.com http://download.cnet.com/Puran-Defrag-Free-Edition/3000-2094_4-11386432.html
Then save a Windows 7 Backup image externally so you never have to reinstall again, just reimage the HD (or replacement) using DVD/Repair CD with the stored image. Backup Complete Computer - Create an Image Backup