Loadrunner 8.0 installtion error - Miregsvr.exe

After installing Mercury Loadrunner Testing Tool in SONY Vaio laptop, asks for reboot winxp. But after restarting get this error message "miregsvr.exe - entry point not found" "The procedure entry point mxdr_clone_p_aes_string...could not be located in aes.dll". When manually registered the dll shows a processing window "completing setup...." and with the error mesage "File C:\Program Files\..\Mercury Loadrunner\bin\aes.dll is missing entry: "ProductName" in Section: "General""

Can anyone say why this error and its work around.