Unable to re-install Avast Free

I had to reinstall Windows XP, and then re-download Avast Free. However, I have downloaded it three times and I Keep getting an error message that the program needed to be reinstalled. HELP!

Did you install it after downloading it? Just downloading it (no matter whether it’s one or three times) won’t do the job.

Go to the control panel>add/remove programs. Wait for the list to populate. Click on the entry for Avast, then “Change/remove” then from the options, select “repair”.

Did you re-install XP from a recovery partition, or from a CD? If you installed from a partition (sometimes called a factory restore) did you remove the AV that was already installed before installing Avast?