cannot open excel 2000 on iis 8.

when i run asp.net c# on iis 8, i m not able to open excel sheet. The log shows as

Product: Microsoft Office 2000 SR-1 Professional -- Error 1706. No valid source could be found for product Microsoft Office 2000 SR-1 Professional.  The Windows installer cannot continue.

error when i save excel..
ExcelWork.SaveCopyAs(strCurrentDir + FileName);//FileName is name of excel.
//strCurrenDir is from root to current folder where i want to store excel.