Light Blue Bits Dispersed

When I get to the Log On screen, two of the user pictures have some small light blue bits joined to their right. When the mouse moves over them, they get smaller, and when it is off, they go back to their original size. After logging in, this problem is continued on the desktop, where it does it around a medium sized white box in my background. It happens in any program opened up, around the top, and around the Start menu bar. After a while, Internet Explorer stops doing it, apart from on certain pages, the same each time. However, when Internet Explorer has got over the problem, any programs opened up in front of it do not have the problem, until you close or minimize Internet Explorer. It does not happen to the three other users which, on the Log On screen do not have blue bits on. The lighter bits of an image tend to get light blue bits dispersed in. Is there anything I can do? The problem started around two days ago, without any seeming action to start it.MS Paint does not stop showing blueness even with Internet Explorer open, until size of window is changed to the actual size of the canvas minus about 20 px.