Revit Architecture 2011 free trial- stuck in demo mode

[klbailey]

I have downloaded the free trial version of Revit Architecture 2011, but when I try to use it a message pops up saying that the license needs activation. My only options are to click activate (but I do not have a serial number by which to activate the product) or to close the window and following windows which warn me that I now may only work in demo mode (the program does run normally in demo mode). The "Run" option which appears on the first window is grayed out. 

Clicking on the R in the upper left hand corner then clicking licensing bring up another window which has the options of "Standalone - locked," "Network" (which I do not have atr my disposal), and "Demo/Viewer." Clicking the option of "Register..." under the Standalone option bring up the first window mentioned above. 

This problem persists both when I try to open the program through saved work or the program shortcut itself. 

I have the student version downloaded onto a computer of mine, but I would like to download this 30 day free trial onto a second computer of mine. 

How do I get my trial version out of demo mode and into the 30 day free trial mode? 

[hashim.mundol]

this happens when you have already installed a trial version before;