I have Windows 7 and MT5 had no problems with Build 642. Today MT5 was updated with Build 655 and it gets no connection more to Internet!!! What's the matter??
1. It may help to install outside C:\Program Files for Vista/7.
2. Install MT4 and see if it running.
3. Did you try register or login ?
Ok. Now it's working, with Build 655 (on Windows7). Together with MT5 (Alpari - UK server). Thanks.