After months or years of writing files to your hard drive, your drive can easily become fragmented. Files are stored all over your drive and not in a continuous block, which means that it takes far longer for your drive to search for and find the files it requires to boot your computer and load applications. Result is that hard drive access seems to occur continuously and your computer operates more slowly. One solution is to backup your important files and re-install Windows. The other solution is to defragment your drive.
Auslogics Disk Defrag 1.1.5 is a free defragmentation tool that is faster than the tool built in to Windows XP. It will rearrange the files on your drive and place them in a continuous block, where possible, speeding up access to your data. However, if you have a rather large hard drive, you might find that you need to leave it running overnight as it will take time to finish defragmenting your drive.
Ceres, located in the asteroid belt, has a carbonaceous-rich upper crust, SwRI study claims
The spacecraft found traces of hydrogen and oxygen molecules, known as hydroxyls, embedded in the rocky surface of the asteroid
The skeleton was unearthed more than 20 years ago in South Africa
Moon's dark side is mountainous, rugged and never visible from the Earth