Cannot install Avast 5

[channy]

Hi, I have wasted several hours trying to install the Avast version 5. No other anti-virus on computer, Windows XP running. I have tried both saving and opening the file but I get the same error message

Setup Selfextract - An error 82 (00000052) has occured. Last performed operation was extracting main exe

[Pondus]

https://forum.avast.com/index.php?topic=2736.0

http://www.sevenforums.com/system-security/113782-trying-install-avast-free-5-0-677-a.html