ERROR installing apache archiva on my sytem

Can anyone help regarding this... i'm stuck :(

Goto the folder apache-archiva-1.3.3 and the following:

.\bin\archiva.bat install

As khmarbaise says above, you probably need to log in with administrative rights.

Another alternative is to run:

archiva console

This will start it within that console - however you'll then need to keep it open and restart manually after a reboot, where a service can run in the background and start automatically.