Tater:
Stock prices did not fall.
October 26, 2012, Microsoft released Windows 8 MSFT stock price $28.21
October 17, 2013, Microsoft released Windows 8.1 MSFT stock price $34.96
April 8, 2014, Microsoft released Windows 8.1 Update MSFT stock price $39.82
Yesterday MSFT closed at $40.47 up 1.63% on the day. If you had invested your $31000 Tax Free savings account in MSFT the day before yesterday you would have made a capital gain of $505.30 yesterday.
If you had invested your $20000 Tax Free savings account in MSFT when Windows 8 came out and held the stock to yesterday your gain would have been $8691.95. That is not losing money. That increase in stock value is what, again, has made Bill Gates, at 77.5 billion dollars, the richest man on earth.