I am not sure what kind of mistakes I did! Now, on my desktop, I cannot see any icons, including "My Computer" icon and even "Recycle bin". If I create new folders, it cannot display also. What should I do? Please help me!!!

You might try a System Restore to a point prior to your problem:

start > All Programs > Accessories > System Tools > System Restore

Yes. I got it. Before I submit my problem in this forum, I've already tried "system restore" but the restore point is not very earlier. Now I tried the restore point before one week. Then, I got it. Thank you for ur kind advice!

No problem. Glad all is well.

Let us know if we can help further in the future.