Thin client networking?

Hi recently I’ve had an issue with a virus and firewall lock out which affected windows file sharing and resulted in us not being able to network clinic office.. had to eventually do a clean install because I couldn’t control the firewall services at command line level… i.e. I couldn’t turn it off

So I was wondering if any body out there is running thin clients networking and how easy is it to live with and run… as a small business I’m the IT guy as buying in services is too expensive..

I’m thinking of putting in a dell optiplex fx170 with DeTOS embedded (OS is free from Dell) with terminal services to server

Anybody done this or something similar? some pointers would be great..

Many Thanks

Colm