Why does my computer hangs (especially when using microsoft excell) whenever i print with sharp ar-153e

Any number of reasons. But quite simply PC's get "congested" over time, with the addition of new programs, and the removal of others. They will slow down over time, simply due to the addition of these programs, but a little maintenance can make dramatic improvements.
A (free) excellent program that you can download, and run, is "CCleaner". Follow this link, to download it, then run the "Cleaner", and then the "registry" portion, (remove all entries that are detected in each scan). It only takes a couple of minutes to run it, and it will almost certainly improve your PC's performance.
Hope it helps:)
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http://www.filehippo.com/download_ccleaner/