Helping two people at the same time is confusing

To the guy who said -relight crashed his PS; that is normal.
It will start to relight at the point where it loads the map, you see the blue loading bar move and then when it freezes it starts to relight the map.
Sometimes the PS window will become completely blank and it will seem that it crashed. It hasn't however. Just be patient as it can take really long depending on the size of the map and your pc.
What I always do:
Go to the map that needs relighting while NOT using -relight in the shortcut.
Log out.
Add -relight to the shortcut.
Start Planeshift and log-in.
Wait for relighting to complete (can take long)
Shutdown Planeshift
Remove -relight from shortcut.
Log-in again to have a freshly relighted map.
To the guy who had an Intel Intergrated Graphics card:
That's not even a real graphics card, buy a real one for 50$, it'll spare you tons of issues now and in the future.
To the same guy that still hasn't posted his pc specs:
As was said 3 times already use Start-->Run-->dxdiag.
Post the stuff that's under System and Video (something like that, use your imagination)
Read the threads that Rolenun and Karyuu linked to for more info.