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Note: Do not use your mouth to blow the Dust out of a Laptop. If using a can of compressed air use the can according to the directions on the side of the can as you can cause damage to the computer if used incorrectly. Also, update the BIOS of your system:

i recently had to downgrade my dell vostro 1540. it can pre installed with windows 7. this laptop was purchase specially to work with a piece of equipment. the probllem arose when i realised that the equipments datalogger/application would not work on a windows 7 platform, only xp and older.