Using Windows XP on privately-built machine. I have two email accounts on the system, one is Gmail and the is is Yahoo. Everything has been fine for the last four years but now I cannot access my email after I turn on my computer. I can open every other internet site the same as usual but email will not open until the computer has been on for about five hours. Then it runs fine. Should I leave the computer on and never turn it off now? I am getting a Windows 10 system soon but would like to keep this computer for my wife's use. Thanks for any ideas you may have.