The following instructions describe how to temporarily disable applications running the background which can cause conflicts with Steam. These instructions are for temporary, diagnostic use only and your system should not be left in this state.
Please try this:
Click Start > Run (Windows Key + R)
Type in:
msconfig
Uncheck the box labeled "Load Startup Items".
Now, click on the "Services" tab.
Please make sure the "Hide All Microsoft Services" box *is* checked.
Then, click "Disable All".
Click "OK" and allow your computer to restart
Test the issue and let us know the results. This is for diagnostic purposes only. You should not leave your computer in this state, but it may help us determine the cause of the issue.
To set the system back to normal, launch msconfig again and choose "normal startup", close the window and restart your computer.
that?try it :P