Build 402 problem

[Deleted]

Hi,

When using my MT4 this weekend I received the LiveUpdate pop-up message to update to build 402 (am currently on 401). I selected to update and the update went thru and then asked if it could restart my MT4. I selected Yes and then my MT4 would not open. I even later tried start my MT4 via the MT4 icon and exe file but no success. Because I have more than 1 MT4 installed on my PC I did the update on a couple of them. Same story. When I re-install build 401, everything is OK.

Regards

Which operating system......?
Don't install in \program files on Vista/Win7
[Deleted]
I run Windows XP (SP3) on my PC. I also installed COMODO firewall/ antivirus more or less the same time so I am not sure if that has anything to do with this problem