To download Adobe reader for Windows XP, follow the instructions below:
 First, go to the Avast official site and download the link from there.
 Now save it in a folder that you prefer and after downloading is done, run it on your computer system.
 Accept the end user license agreement and continue with the installation.
If you have any technical issue at any point during the process, visit Adobe official site for assistance by technical experts.

Read more:-
avast antivirus free download
download avast cleanup