gotoassist

I want to let a tech rep. to be able to join me on my computer,its not letting them on to see my computer.

I don't have any experience with that program but maybe Team Viewer 5 can help. It's free for non commercial use.

http://www.teamviewer.com/index.aspx

If you have W7 Professional or higher then remote assist is built-in (not home or starter).
http://www.howtogeek.com/howto/windo...windows-vista/