my web app need to microsoft.office.interop.excel.dll  file &  without Microsoft office install it  getting error like

Retrieving the COM class factory for component with CLSID {00024500-0000-0000-C000-000000000046} failed due to the following error: 80070005.

Microsoft Excel Application entry missing in DCOMCNFG

so i need to install office on my server

help me plz