Reinstalls are no longer necessary with built-in drive imaging in Windows 7. Just save externally a Windows 7 backup image when it is running perfectly, and at any time in the future you can reimage your HD (or a replacement) with the saved image using the DVD/Repair CD.
To make the backup failsafe, save a second image using free Macrium Reflect as images can fail sometimes.
When you make your Windows 7 backup image, it will offer to make a Repair CD which you should keep on hand anyway.
And be on the lookout for a friend who can loan you a Windows 7 install DVD should you ever choose to clean reinstall without the factory bloatware - you can unlock all versions in any Windows 7 DVD using the ei.cfg removal tool. Then install your licensed version using the Product key stickered to your machine, which you should write down and safeguard along with your Anytime Upgrade key.