He can't download nor open FRST because he can't get Firefox to open the link - it gives him the 'xpcom is missing' reply. He's found the xpcom file in his Trash and dragged it back into his Win32 folder, restarted - nothing different.
My 77 yr old Dad bought and installed Malwarebytes Premium and since then, it blocks most webpages - won't open them. He is using Firefox. It seems MalwarePremium also deleted/stopped a XPCOM.DLL file from working. Help please? Celia