This is very general error message. Now the first thing that we should do is please check
1) Can we Succesfully start from SQL Server Configuratio Manager.
2) Can we Succesfully start from Services.msc
3) After this try to connect thru SSMS (not start but connect).
4) Can we go thru System & Application logs for any potential .NET,
MDAC other sort of errors.
5) Else try to reinstall Client Components