Pokerstars not installing

[F That]

For some reason one day i tried to login to pokerstars and it wouldnt pop up so i uninstalled it and now im trying to reinstall it and every time i try this message pop ups

<font color="red">The installer has encountered a disk write error.

Please insure that all other applications are closed before attempting installation. Also insure that the destination drive has sufficient space and that your have the necessary access rights.</font>

I have no idea what to do... what do you guys think i should do? Where is the destination drive?