Need help installing RPMs
 

I recently installed Redhat Linux 7.0 and I use Gnome,
I was having a problem with RPM files, whenever I double clicked on one to install it an error message popped up, unfourtanatly I cant remember what it said because now when I double click on an RPM I just get a window saying 'Select an aplication to open *.rpm'
Can anyone help so that I can install RPMs?

use "gnorpm" (GUI) or use "rpm" (CLI)

I haven't used 7.0 in a few, so I don't recall where "gnorpm" is on the menu, but in 8.0 I think they call it "Package Manager". Either way, I prefer the command line(see below).

Do a "man rpm" to find all the options for "rpm", pay special attention to the "--test" option if you are new to all of this.

As jdc2048 mentioned, you're looking for 'package manager', however, I have to agree that it is bad practice for noobs to shy away from the command prompt. You'll find that everything is faster and easier. Installing from the CLI is simple:

rpm -i package-name.rpm

that's it. To remove, it's just as easy:

rpm -e package-name

Don't fear the CLI, it's your friend. . .