Whatever your decision may be, plan for the long run. So if you are currently scared and tempted to put your $ into money market funds, it would hurt you in the long run. My investments have been hurt, like everyone elses with the stock market downturn, but I asked myself where I wanted to be long run, and the only answer was "stocks." If that's the case, then you put your 401k there, and if it's already there, you leave it there.
The problem with temporary safety choices such as money markets is that you never know when to reenter the stock market. You may miss some downturn while you are in your safe haven, but you'll also miss a good amount of upside while hesitating over a reentry point.
The commercial was talking about annuties, perhaps? They have their advantages, but they are very costly. Be careful and read up on everything first before going into one of those.