i have been trying to reinstall avg free but every time i down load it and click on set up, i get and error reading

nstaller initialization failed due to following error:
Undefined error: Initialization of the setup data file failed.
Opening of the setup data file "C:\Program Files\Grisoft\AVG Free\setup.dat" failed.
No such file or directory

Try downloading to a different directory, or creating a new one (on, say, the desktop.) It looks like the problem is that the setup.exe is trying to reinstall something that was uninstalled and deleted.