Muel07

https://www.gta5-mods.com/misc/realism-dispatch-enhanced After installing the new gameconfig in the pinned comment link It works fine for me.

LSPDFR itself doesn't produce those messages. You might want to check the config files of other plugins you have installed to see if it's in there.

Go into the .INI file for Traffic Policer and look for "CreateBlipsForAmbientEvents" and "ShowAmbientEvenDescriptionMessage" and set both to false. They should be the first and second items to change when you open it up. That should stop the messages and blips. If it doesn't, then you must be running a different plugin or script causing it. 

hey sam, open your monitor's menu, sometimes you have to manually tell it to take input from the dvi/hdmi port instead of the vga one.

I do indeed. Seeing the picture on Amazon that you just linked made me realise that in fact, one did come with the PC! I sound like a complete idiot now haha but at the time I had no idea how all this worked! Thanks for the help though! Much appreciated. 
 
Kind Regards,
Sam
Only issue now is that nothing is displaying on my monitor! Could it be that my monitor isn't compatible with the graphics card?
Kind Regards,
Sam. 

I'm guessing you have a VGA cable then? It's usually a blue connector. If your monitor supports DVI or HDMI, I would recommend buying one of those cables. If not, you'll need a VGA to DVI converter: http://www.amazon.com/StarTech-DVI-Cable-Adapter-DVIVGAMF/dp/B000067SOH
A lot of graphics cards come with them - you should see if they sent one with the computer.

Make sure your monitor is plugged into the graphics card in the back of the computer (the DVI or HDMI ports for the graphics card are generally on the bottom, whereas the integrated ones are on top).