Hello familytechie and welcome to Seven Forums.
I'm not sure if it will help, but you could try running a system file checker scan from an elevated command prompt (option two.) It will check the integrity of all protected Windows 7 system files and replace incorrect, corrupted, changed/modified, or damaged versions with the correct versions if possible. If problems are found run the scan 3 times and reboot the computer after each scan. SFC /SCANNOW Command - System File Checker
If the SFC doesn't help, a system restore may be the quickest way to reset all file associations at one time. This tutorial can be helpful for when a file extension type opens with the wrong program by default, has the wrong icon, or is missing or corrupted in the registry, but is a "one at a time" solution. Default File Type Associations - Restore
If still unable to reset all file associations it may be necessary to do a repair install. Repair Install
Perhaps one of the more knowledgeable Forum members will jump in with something I've missed.