Fix for steam.exe (main exception): unable to load library Steam.dll Error
After installing Steam on another computer and while launching it I got the error – steam.exe (main exception): unable to load library Steam.dll . 
I did some research and have uninstalled and tried installing again and again but still the same issue. Some forums even recommended that I need to copy files from disc onto Steam installed folder. I even made sure none of the Programs mentioned in Steam Support are interfering with the installation. I have changed my Bitdefender firewall to permit Steam exclusively, but it failed too.
Finally, I realized the application blocking Steam to connect to its network was Peer Guardian. From the task manager, I have closed ‘pg2.exe’ and I was able to run the Steam application properly. You can even see the Peer Guardian Logs and allow the connection to Steam servers.
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May 31st, 2009 at 4:54 pm
I can`t youse my cs… it will not sart!!
June 3rd, 2009 at 12:23 pm
Thanks for this mate. I forwarded all the ports, I set up all the firewalls, but I just didn’t check PeerGuardian! Disabled it whilst I installed Steam and it worked a treat!
June 11th, 2009 at 8:15 pm
Hello, I do not have Peerguardian but I am still getting this error! someone please help me! my email is badboy_papu@hotmail.com PLEASE HELP
October 10th, 2009 at 5:25 pm
I also dont have Peerguardian and i am getting this error to so yeah please email me if you can fix it. foxsunion@yahoo.com