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A remote code execution exploit in Internet Explorer 6, 7 and 8 was discovered in December, for which Microsoft has yet to release an official security update addressing the issue. It is recommended to upgrade to Internet Explorer 9 or 10 immediately. For Windows XP users who cannot upgrade, either install another browser such as Mozilla Firefox or Google Chrome, or install a temporary Microsoft “Fix It” solution until a full security update is ready.
The process of copying and deleting files on a computer hard drive can cause files to be broken up into pieces and stored in numerous locations throughout the drive. Defragmentation is the process of grouping fragments of files on the drive into single locations called contiguous blocks. Having all the parts of a file in one location means that the hard drive will spend less time to seek during a read operation, which speeds up file access and the system in general.