Question : Installing updates server 2003 r2

I really do not do servers although OS2 comes to mind.  My Doctor has a server with an application for "Doctors" on it.  Snooping around at Windows Update, there were optional ones that seemed important like Terminal Services and Dotnet and Windows server and policy client side extensions.  Would I be safe in installing those.  Is server fragile?
Should those be applied or left alone?

I am good at normal computers with XP, Vista and 7

I am doing this because he will start charging me to be his patient and maybe we could exchange my time for his fee.  

Answer : Installing updates server 2003 r2

Oops, I should have caught that, you had it backwards.  Should be "mysql_query($queryString,$con)" .