Currently Being ModeratedAug 19, 2012 12:38 PM (in response to CCG121)
Install the Mac OS X 10.6.8 Update Combo
That will reinstall the App Store for you which may help.
It's ok to do this even though you are already running v10.6.8.
but to update to 10.7
By the way... v10.7 Lion is not available from the App Store any longer.
To purchase Lion call 1-800-MY-APPLE (800-692-7753).
You can upgrade directly from Snow Leopard to Mountain Lion v10.8 if your Mac qualifies > Upgrade your Mac to OS X Mountain Lion.
Keep in mind, for downloading Mountain Lion from the App Store, a high speed internet connection is strongly recommended as noted here > iTUNES STORE - MAC APP STORE - TERMS AND CONDITIONS
If you need to reinstall OS X or repair the the startup disk using Lion Recovery, that requires broadband access to the internet via Wi-Fi or an Ethernet connection. OS X is downloaded over the internet form Apple when OS X Recovery is used for reinstallation.