I have an HP G70 laptop with 150GB local disk memory capacity. It shows that I have 4.54GB worth of programs installed, the rest are personal documents and a few media files of which am sure they couldn't take more than 5GB installed. What I don't understand is that the local disk indicates that am running low on memory (less than 3GB left). I tried to perform the disk clean-up process but still it shows low memory left. I also ran the anti-virus scan and it show no infections. What could be the problem?