All providers of free anti-virus software would like you to upgrade to their full security suites, so there's nothing unusual in seeing suggestions that you shoud upgrade. (Unless you really need a full security suite, which is unlikely if you're reasonably careful about your security anyway, you can ignore them).
A bit of googling suggests that 'EMS is stopping' might disappear after simply restarting your computer. Otherwise try going to Control Panel > Administrative Tools > Services and scroll to AVG Email Scanner. Click to highlight it and select Restart the Service.