i got some solution
i followed few steps someone suggested me
properties window of c:OracleOra92
in the security tab for Authenticated Users, Uncheck the "Read and Execute" box in the "Permissions" list under the "Allow" column and Re-check the "Read and Execute" box under the "Allow" column. in the "Advanced" button and in the "Permission Entries" list made the "Authenticated Users" listed there with:
Permission = Read & Execute
Apply To = This folder, subfolders and files
ok and ok.
and rester pc
it worked.
Thanks
--Naren