Wall Street capped one of its worst weeks ever with a wild session Friday that saw the Dow Jones industrials gyrate within a 1,000 point range before closing with a relatively mild loss and the Nasdaq composite index actually ending with a modest advance.

Investors were still agonizing over frozen credit markets, but seven days of massive losses and the possibility of further government support for the markets tempted some investors late in the session.

Investors suffered a paper loss for the day of about $100 billion, as measured by the Dow Jones Wilshire 5000 index. For the week, investors lost $2.4 trillion, and over the past year, the losses have piled up to $8.4 trillion.

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