In a lot of versions of Windows, there is an option called Sticky Keys in the Accessibility Options. Ingeniusly on Windows XP it is turned on when you install Windows, therefore when you play your first game of HoverRace, it decides to tell you that you held down shift for 5 seconds *THANKS BILL*.
To turn off this option, simple do the following.
Goto My Computer > Control Panel > Accessibility Options
Click the Keyboard tab and untick the following.
Then click on the settings button by each of those 3 and untick ALL BOXES that are ticked.
This should free HoverRace from Sticky Keys. Enjoy.