I need to display my portfolio real time on my desktop.

It's a picture portfolio right?  I think you might be looking for something like this:
http://www.softpedia.com/get/Windows-Widgets//Video-Widget/ImageView-widget.shtml

ImageView is a simple image viewer that also features a slideshow function.

My favourite image utility, Irfanview can also do a slideshow. See

http://voices.yahoo.com/how-slideshow-using-irfanview-57943.html

You can download Irfanview from www.irfanview.com

If you want to have the slideshow as your "wallpaper", you can do this if you have Win7:

http://www.dummies.com/how-to/content/how-to-create-a-desktop-wallpaper-slideshow-in-win.html

For older versions of Windows, try this:

http://www.gphotoshow.com/wallpaperss.htm

No I am actually talking about my stock portfolio.

Yahoo finance has a way to set up portfolios with 15-min delayed quotes.  If you want real time quotes, you may need a paid service, as I do not know of any provider that will do that.

Hmm, you could try this: http://www.softpedia.com/get/Windows-Widgets/Widget-Finances-Business/Stock-Monitor.shtml

and there's some more options here:
http://www.softpedia.com/dyn-search.php?search_term=stock+widget&x=0&y=0