Possible Duplicate:
Double cursor in Skyrim
The white arrow (operating system cursor) shows up at all times whilst playing the game on windowed mode after tabbing out. In screens where the Skyrim cursor is also present, they are both visible.
Solutions like "pressing Esc before you tab out" aren't useful because it won't work whilst in a crafting window. The main use of tabbing out for me is to use web-based tools for Alchemy recipes.
I know there must be a better way of fixing this since I've played the game before on this computer for a whole playthrough without this issue.