Hi, I bought a brand new Windows 7 HP intel pentium laptop a few weeks ago, it has a 700gb hard drive, however a few days into using it I had a pop up telling me that I had low disc space, upon deleting a few things, I managed to free up 20gb but my space continues to lower even after deleting various software. I have nothing on my laptop that takes up anywhere near 100gb let alone 700, what could be the problem ?. Thankyou.