[quote]Hi,
(sometimes Turns take up to 2 and a half minutes or the game temporarily freezes). I'm wondering if there's something cheap/quick I can do to increase the quality of the running of this game. [/qoute]
Turns usually take long either due to big amounts of ships that need to be moved or due to the AI not having finished it's preparations while you did your turn.
The first doesn't really have a cure, I suggest bringing a book (I personally reread the hitchhikers guide to the galaxy when I am many years into a huge galaxy game, turns can take a while), the second could simply mean that you're not taking your time doing your turn, it might also be due to a very slow CPU, but this is normally not the case.
When turns pass, check if you see ships moving, if so, grab a book once it starts to take minutes.

Another extra thing: I might get a new laptop in a few months as I've had this one for about 2 years now and it's not fantastic and I was wondering how I'd go about loading Galciv2 and the 2 expansions onto it, I have ordered hard copies of the latter two and I have a hard version of the original, but I'm worried I might make some rash mistake and lose these 3 great games (as I said I'm useless with computers so maybe I'm just being overcautious).
Using the registration codes that you got when you ordered this game from StarDock you will always be able to redownload the game using Stardock Central. Hold on to the codes and it'll be neigh impossible to lose this game.