Class not registered

Hi all,

When i am running my SSIS package and source is Microsoft Excel 97-2003 Worksheet i am getting below error:

[Connection manager "Excel Connection Manager"] Error: An OLE DB error has occurred. Error code: 0x80040154. An OLE DB record is available.  Source: "Microsoft OLE DB Service Components"  Hresult: 0x80040154  Description:"Class not registered". 

Can any one help me.