Awesomeness,
Your 401(k) assets are held separately from AIG's own assets. So aside from some potential administrative hassles if the company actually goes out of business, your 401(k) assets should not be at financial risk of loss. The investments in your account itself can go down (i.e., the funds you're invested in), but an AIG bankruptcy doesn't actually mean you can lose your 401(k) assets to AIG's creditors, because your assets are treated as being segregated and separate from AIG's own money that's available to AIG's creditors.

Technically, your assets are only at risk if they're actually invested IN AIG itself, or in assets that AIG guarantees.

I hope that helps a little!