For months my Windows Firewall would not function. I tried Microsoft and a dozen other repair methodologies, but nothing worked. I resorted to finding an online Firewall [freebie!], but they were not satisfactory for one reason or another. I decided to try a repair once again and came across Tweaking.com. There was a simple little "download" to repaid windows firewall, and I tried it. It took 86sec to repair, and now functions as it did when I first got this computer. Bravo!
Now, if there was just another such program to allow updates rather than the odious "8024200d error", I would be ecstatic. Updates are never completely successful, though I do utilize their Troubleshooter and it works to a limited degree. I feel certain that anyone that can write a program to correct a broken firewall, will find this one also fairly simple. Bon Chance!!