As a fully qualified computer engineer, I will get to the root of your problem quickly.
I support a single PC, to many hundreds. I deal with all sorts of issues which can range from slow network speeds to error messages or even no power. I have many years of experience which means I can diagnose problems and either fix them or recommend a course of action. Over the last 30 years, I have worked for some of the biggest IT companies such as IBM, Telewest Blueyonder (Virgin), Equiniti, and Sonae.
Specifically, I have worked on and tested motherboards and PSUs (power supply units), printers, servers and switches, networks, telephone systems, and various software programmes.
The operating systems (OSs) I have worked on are:-
Windows (95, 98, Me, XP, 2000, Vista, 7 and 8)
Windows Server (2000, 2003, 2008, 2012)
Linux (Debian, Mandrake, Ubuntu)
Apple (OSX)
I am also familiar with various mobile platforms such as Blackberry, Apple and Android.

I cover the following areas:-
City Centre
Kensington
Toxteth
West Derby
Croxteth
Allerton
Woolton
Mossley Hill
Garston
Speke
Anfield
Walton

To order a system, follow the procurement link above, just register first.