What are "terminal services"?

Hi,
Recently I had an error message continually popping up. So I ran:
http://forums.majorgeeks.com/showthread.php?t=35407
to fix.
The process fixed but now my system is running radically slower.
In an attempt to continue to fix I installed Diskeeper lite. When I launched Diskeeper Lite I received the following message:

"Diskeeper Lite does not allow access via Terminal Services. Purchase the full version of Diskeeper from www.diskeeper.com and you can be using this feature withing minutes."

So, here is my two part question...
1. Does Diskeeper Lite run for free? Or do I have to buy the program? If I have to buy it I can, but I thought this was the free program.

2. What the hell is/are Terminal Services? Is this a sign that I'm truly not cleaned up?
Thanks,
GVgeek

 

Terminal Services is a means of remote accessing a windows service, its part of remote desktop connection (rdp). If this is a server type os, it means you need to log in phyiscaly at the box to run that app, or pay for the full featured version which allows remote running.

 

I'm running vista on my own private machine; not attaching to any network other than the one I have at my house. I have to log in to get access to the machine but not anything else.
I'm not running a remote desktop.
Still confused.