Cant afford further upgrades. I have 2500K at 4.3Ghz. 8GB Corsair vengance ram(1600Mhz) Corsair force GT SSD 120GB. GTX560Ti 2GB vram. Shouldn't this be good enough`?

I have not yet flown it because it is too advanced for me still. And the lag has held me back as well.

I'm about to update the 777 base pack then the freighter pack. to install, is it simply to install 772 and then 774 and it will overwrite automatically? Or do I have to uninstall something first?

Sincerely
Stig