Boot scan Avast 4.1.5

I instructed avast to carry out a boot time scan and it gave the following error number for all files it tried to scan “Error 42100”
I am runing Windows XP SP2
Attatched the Boot log file.
Any help would be great
Cheers
Colin

Hi,

first clean out your Temporary Internet Files, that will greatly reduce the number of errors. ;D ;D

please enter
42100
in to the Search above
→ e.g. http://forum.avast.com/index.php?board=2;action=display;threadid=8339

Do you maybe use an AMD64 ?

I do use an AMD 64 and after reading the posts discovered that boot time scan does not work with this type of processor. Thanks for your help.
Colin