Does the window look like this?
http://dl.dropbox.com/u/25106032/Planeshift%20window.pngIf so, this is PSlaunch and the only window that will pop up is if there's an update pending to be downloaded.
You can possibly ignore it by clicking the 'OK' button and then 'Play' however if the update is large the server won't allow you to play therefore you will need to update.
If you use Window 7 (which you stated you do)Go into 'start' click on 'computer' 'local disk C' click on 'program file' scroll down till you find the
folder 'Planeshift' and click on it, then go down to PSlaunch and
left-click once then
right-click it, click on 'run as administrator'.
OR
Like Naira said. If you have a short-cut, right-click that. Click on 'Run as Administrator'.
Your security
may come up with a warning stating something like this 'are you sure you want to allow an unknown publisher to access your computer', click 'Yes'
Then the window (The PSlaunch window) will pop up with a 'do you want to update?' 'Yes' or 'No' question. What I do, however, is click 'no' and click 'repair' and then that will search for fixes and updates, it will then ask if you want to update, click 'yes' then after a few minutes, hours, days or often even millenniums it will be finished. YAY time to play PlaneShift!!
To do the above you need administrative rights to your computer I think.