Run SQL Loader from command prompt to see what error comes up.
For example, if the error is the following...
SQLLDR.exe - System Error
The program can't start because MSVCR71.dll is missing from your computer. Try reinstalling the program to fix this problem.
...then perhaps re-install the Oracle Client and check to make sure after the re-install, MSVCR71.dll exist in <ORACLE_HOME>/Bin.
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