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Homegroup and Windows FW problems solved but now I can't play L4D2

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LolosArt:
So First I want to say thank you!
I discovered my PC's original problem when I performed a fresh install of Windows on my HTPC and I wanted to join the network Homegroup for sharing. My HTPC wasn't picking up on the Homegroup even though I could see my PC in the network. Then, from my PC I  tried to leave the old Homegroup to create a new one, but windows was not having it. Each time I tried I got a message saying Windows will not let you leave this homegroup.. or something like that. I then discovered that the problem was somehow tied to windows firewall. I tried to start Windows FW, but it wouldn't and neither would it's dependencies BFE and something else. So Homegroup and WinFW were all busted.
I'm not too savvy about these things, but when I run into PC problems I usually have good luck finding solutions. I looked a whole lot before I found Tweaking.com - Windows Repair.
It was the only thing that fixed my problem, but in fixing the WinFW and, more importantly, my sharing capabilities, it created a new one. One that is equally as elusive as the previous problem, but with no solution yet. I've even found others with the same problem online that all resort to reinstalling Windows to fix it. Apparently the new problem has affected all of Valve's Source games (according to this guy http://forums.steampowered.com/forums/showthread.php?t=3017913) , but I wouldn't know because of my 14 games currently installed L4D2 is the only Source game.
So yea, L4D2 doesn't start and the only other sign of the problem i have found is when using RegCure Pro and perform a scan. The app crashes when it gets to the second step in the scan of searching for malware. Funny thing is that it's the only app crashing when performing a scan from these: SpyBot, Malwarebytes Anti-malware and Anti-Rootkit, and Norton360.
So, I'm here because I wanted to say thank you, because your program saved my Sharing capabilites and I really don't want to reinstall windows on my PC. At one point I even restored the old registry to see if I can find a fix again, only to be defeated again by the Homegroup/WinFW thing. I performed the Twaeking.com Window's Repair again and got the same outcome.
I'd greatly appreciate some more help for the new issues generated by Windows Repair's fixes if possible.

Thank you,
Lolo

Shane:
Very odd, I play on steam all the time and never had any problems.

You said when you restored the registry from before the repairs it started working again correct?

If so then at least that tells us that it is something in the registry and not any files, so that will at least point me in the right direct on what to have you try next :-)

Shane

LolosArt:
Right, Steam support even asked me to unsinstall Steam manually to  see if the problem was with Steam. I deleted it completely from registry before reinstalling and still the problem persist.
You said you play on steam, but have you played any of the source games lately? L4D 1 or 2, portal 1 or 2, HL2, etc.

Shane:
Haven't played them in a while, was playing the new thief game though. I do have the new counter strike source.

OK so good, we now know it is something in the registry and not any files or something like that. We know this because you can restore the registry and it works.

So now the fun part, finding out where in the registry that is causing the problem.

Most of the repairs that deal with the registry are permissions and registering files. Some replace core services. So now to help lower the search range of where to look we need to find out if the problem is in the registry for the whole computer or just the current user profile.

hkey_current_user is a registry that is custom for each user account on the system. While the rest of the registry is system wide.

So if you create a new Windows account, login with that account and test the game that will tell me if the problem is under the hkey_current_user or not :wink:

Shane

LolosArt:
I'm not sure if I did something wrong, but after creating a new user account I restarted to logon as the new user and I got this message:
The User Profile Service service failed the logon. User profile cannot be loaded.

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