When I open Em Client it take for ever to open the program
I believe this issue might be connected to your Operation system settings rather than eM Client itself (unless you have numerous accounts with huge amount of data that needs to synchronize).
Check some helpful tips on how to speed up your programs, for example from this Technical blog post or anywhere else on the internet.
my computer is a window xp and also I have 2 e-mails one of them centurylink e-mail and outlook.com
I still believe that your best option is to speed up your startup in general using the hints I linked to above.
Not to mention that Win XP is an older system, so it might be the cause of that.