Nail polish looks great on your fingernails, but it looks horrible on your carpet! Fortunately, it's fairly easy to remove nail polish stains from your carpet. You'll need several things, including nail polish and hydrogen peroxide. You can find more information here: http://www.ehow.com/how_2094926_remove-nail-polish-carpet.html
First get the stain wet by adding lots of water. Then spray with hairspray about 15 times. Drizzle with nail polish remover. Scrub with a toothbrush for 2-3 min..
Repeat process 3-4 times. Then vacuum over for about 5 min.. And repeat process until wanted/needed results.