msvcr7.dll

I installed avast on my daughter’s computer which is a dell computer with windows xp home edition and avast installed but I cannot run it because I get the message msvcr7.dll cannot be found might be fixed by reinstalling msvcr7.dll. Can anyone give any help on how to solve this problem and how to reinstall msvcr7.dll?

Can you try searching this board for msvcr7.dll keyword?
Won’t any thread help? For instance, http://forum.avast.com/index.php?topic=7652.msg61476#msg61476

Also: http://search.microsoft.com/results.aspx?mkt=en-US&setlang=en-US&q=MSVCR71.DLL