Nisha,
I would strongly suggest doing a fresh installed of BI 4.1 w/ SP1 and update to SP2. There are several major enhancement to the FULL suite of BI tools. You can find all documents link below:
http://help.sap.com/businessobject/product_guides/sbo41/en/sbo41sp2_bip_admin_en.pdf
http://service.sap.com/~sapidb/011000358700001063062013E/sbo41sp2_bip_inst_win_en.pdf
http://service.sap.com/~sapidb/011000358700001063192013E/sbo41sp2_bip_upgrade_en.pdf
Regards,
Ajay