Computers, despite their many useful and entertaining applications, occasionally run into problems. Components can break or malfunction through improper maintenance, mechanical error or simply aging. The average desktop PC has an operational lifespan of two to five years. When this happens to the computer system as an integrated unit the user faces the question of whether to upgrade or replace his computer. Both choices have much to recommend them but the answer ultimately depends on the circumstances surrounding the machine. The user must look at the ups and downs of each option before committing time and money to either one.