Can't copy framework.dll

When I run the updater it stops when it’s trying to copy framework.dll from the latest update v4.1.150349.920.

When I check my version in about it says v4.1.150349.920 even though the update hasn’t finished.

My system otherwise:

XP SP3 32bit
avast 5 antivirus
malwarebytes anti-malware

Could avast or anti-malware be blocking comodo from updating or is it something else at fault?