Windows Icons Problem :(

[Saad]

Hey guys when i turned my computer on today thats how i see most of my icons on desktop : like if u see the "My Document", "My Computer " icons .......most of my icons were like this on desktop so then i changed some by clicking right and go to properties and then change icon so i want to knw why this happened??......and how can i change rest of my icon to how they were?   



and when i go to start same problem:

so please reply guys i hoping to get ur help and solve this problem thanks 

[CBMatt]

What protection do you have?

[patio]

Run checkdisk...

[Saad]

What protection do you have?

i am using nod32 .....the good news is that somehow the icons are back to normal dont how??.......i didnt do nothing ..........so now can anybody tell me why that happened ?? what could be the reasons?

[patio]

Run checkdisk...