What is the error message? Did you install into Program Files on Vista or Win 7? If so, maybe, try installing into a different folder? c:\MT\ etc?
philippe5: Since this last version it has been impossible to compile file mq4 in exe4.
You can not compile decompiled code any more.
If you don't think it is decompiled code post it. If it is you will receive a ban, otherwise we'll try to help.
Decompiled code is stolen code. Either you are a thief or the receiver of stolen (intellectual) property.
Either way we will not be an accomplice after the fact to theft.
See also https://www.mql5.com/en/forum/134317
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Since this last version it has been impossible to compile file mq4 in exe4.
expert advisors which were installed before are goint to work but it's impossible to add new expert advisors.
So i can't add expert advisor in mq4 on my mt4.