WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
MSDW S&P 500 INDEX FUND - CLASS C
</LEGEND>
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-END> AUG-31-2000
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<INVESTMENTS-AT-VALUE> 2,521,304,830
<RECEIVABLES> 10,200,866
<ASSETS-OTHER> 112,978
<OTHER-ITEMS-ASSETS> 68,380
<TOTAL-ASSETS> 2,531,687,054
<PAYABLE-FOR-SECURITIES> (3,607,212)
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> (5,396,427)
<TOTAL-LIABILITIES> (9,003,639)
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,966,951,682
<SHARES-COMMON-STOCK> 13,268,332
<SHARES-COMMON-PRIOR> 10,269,102
<ACCUMULATED-NII-CURRENT> (4,252,214)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (22,167,118)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 582,151,065
<NET-ASSETS> 211,446,488
<DIVIDEND-INCOME> 25,846,907
<INTEREST-INCOME> 1,426,040
<OTHER-INCOME> 0
<EXPENSES-NET> (31,525,161)
<NET-INVESTMENT-INCOME> (4,252,214)
<REALIZED-GAINS-CURRENT> (18,897,275)
<APPREC-INCREASE-CURRENT> 322,081,076
<NET-CHANGE-FROM-OPS> 298,931,587
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (390,381)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6,318,335
<NUMBER-OF-SHARES-REDEEMED> (3,344,237)
<SHARES-REINVESTED> 25,132
<NET-CHANGE-IN-ASSETS> 676,252,366
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 1,712,662
<OVERDISTRIB-NII-PRIOR> 0
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<GROSS-EXPENSE> (31,840,573)
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<PER-SHARE-NII> (0.04)
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<PER-SHARE-DISTRIBUTIONS> (0.03)
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<EXPENSE-RATIO> 1.50
</TABLE>
