Low system resources. The shell tried to open the file, parse the resources in the file, and extract the icon; get memory for the icon, convert it to a BMP, then paint it. One of those operations failed, so it painted the default icon.
Do the icons come back when you refresh your desktop? Click the "show desktop" icon, or press Windows+D, then press F5. Does that make it repaint correctly?
I deffinatly do not have a problem with system resources with 2GB and 2.4GHz dual core, it is as if it cannot find the icons. I fixed it by right clicking properties then change icon. I still find it odd that Sandra caused a problem like that.
Desktop refresh is the first thing I tried, but it didn't do anything.