RDS VDI setup questions

i looking adding 10 thin clients office new server 2008 r2.  i use hyper-v , remote fx.  my question on vm create in hyper-v need have terminal services on allow thin clients access it? guess don't understand how of thin clients access same virtual image.  is there program handles or terminal services.  i not want co-workers accessing server os terminal services rather co-workers use same vm image  which can restored @ given time(we keep having virus/malware issues in office , im hoping downtime , cost of applying new windows os image of infected computers).  

i going run "workgroup" win 2008 server r2 no domain or controller setup hyper-v , remote fx , deploy 1 vm image 10 thin clients.  so ts ok on vm in hyper-v?  i cannot imagine ts not running smoothly basic ms office , other small apps internet use on hyper-v  vm thin client.  i want basic setup cut down on long term hardware cost , eliminate constant re-installs of win7 images computers getting infected.  any input appreciated.  

Windows Server  >  Remote Desktop Services (Terminal Services)