Why does my computer leave white boxes behind windows?

Question

This only happens when I un-click "Show Desktop Icons." I normally have them off, since I use Rocket Dock. And almost as if my video card can't handle it (even though it can) I get these laggy white trails/boxes behind any window I drag across my desktop. On top of that, windows are slow to minimize and maximize. It's quite annoying. Any help is appreciated.

System Model: P5KC
Processor: Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz (2 CPUs)
Memory: 4096MB RAM
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Card name: NVIDIA GeForce 8800 GT

bluedragon · Accepted Answer

right-click on the desktop >
point to Arrange Icons By >
and make sure that "Lock Web Items on Desktop" is un-checked

keep us posted....

Rannvijay · Answer

There is problem with Video Card or may be your Windows might be infected with virus. Since your computer is fast enough, these two could be problem.
Try running Windows without rocket dock.

Why does my computer leave white boxes behind windows?

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