hdd no space left in 3 months how is possible

Hi,
My hdd got full in 3 months how is this possible? It never happened with me before?
What can i do?
Is it any virus?

Have you tried running Scandisk?

Have a look at this thread
http://forums.techarena.in/vista-help/755552.htm
I hope this helps you if your problem is same like this!

Thanks Windwithme for the link!
I will try using scandisk utility & let you know what happens!