Installing and uninstalling software, over a period of time, will result in your Registry being clogged up with old remnants that aren't correctly uninstalled when you remove software from your system. A similar process can occur with your hard drive. When you install software, then uninstall or simply move files around your system, you might find that accessing files takes longer each time you attempt to launch an application.
One solution is to defragment your drive, which will rearrange the contents of your drive so they are in one continuous block. It means applications launch faster and your system boots more quickly. IObit Defrag 1.1 is a beta version of a forthcoming free defragmentation tool. Other options include Diskeeper 2007, OO Defrag 8.5 or the free and popular Auslogic Disk Defrag 1.1.
Some parts of Atacama have not received rainfall for 500 years - but a sudden deluge of water upset the Desert's delicate biological balance
Spitzer Space Telescope could not spot Oumuamua, suggesting that it is actually pretty small
Greenland crater one of the 25 largest impact craters on Earth
This long-sought progenitor star was identified in an image captured by Hubble in 2007