Well it looks like you were using a version of WindowsBlinds. That is the Stardock Logo on the start button. Were you using the free version of WindowsBlinds 5 by any chance?
Have you used teh Stardock Central to update to the latest version of WB5?
Also are you using a theme that is compatable with WB5 and its features?
Best bet if nothing has worked load WB up. From there either try to reload the skin or apply a different skin and see if it works. If a different skin works it might be your skin is corrupted and you need to delete that skin and redownload it.
You have to open the windowsblinds app up. From there you choose your skin. Either that or right click on your desktop and go to themes or appearance. Change th elook of you XP there can also work but it wont work thru Windowsblinds.