You are probably trying to read an Excel 2007 file (xslx).
Try using the connection string described
here[
^].
Try something like
"Provider = Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\Arnold\Desktop\Annexcelweb\ExcelImport.xlsx;Extended Properties=Excel 8.0;HDR = YES;IMEX = 1"
.