Phew...A few simple questions but it's gonna be a long-winded answer lol..
Ok.. if you replace the old HDD for the new which is quite a simple process, make sure you make a note of the cable set up. Then you'll need to boot the pc
but press delete at the first screen (the one with all the drives and info on) this will get you into the 'bios'.
You'll now see a range of settings, you need to go into each one until you find whats called the 'boot order'. This tells the pc which device to use first when booting up and you need to change your configuration so the first device is CD/DVD, second will be HDD and third is floppy.
Once you've done that, save and exit which'll reboot the machine. Make sure your set-up disk is in the drive and wait for the words to appear 'To boot from CD/DVD press any key' (you may not actually see these words but don't worry about it as the pc may just boot from the disk)
Ok, now follow the prompts, you'll need to format the new drive (this is why you need to boot from CD otherwise it can't be done). You'll be able to format the drive when you reach a page asking you where you want to install vista. You'll first be asked to make a 'new' partition and what size and so forth. Just click yes to the default one on offer as this is the easiest option. Now click next and install vista. Don't worry too much about drivers at this stage as vista does carry many drivers itself just to get you started...
Once the installation has finished reverse the process above for the boot order and change it back to, First: HDD, Second: CD/DVD, Third: Floppy.
If everything has gone ok you should now just be needing drivers. You can do this in two ways.
1.
Your internet connection may still work (as I said vista has many drivers itself) but if not your ISP may have given you an install disk. Use that to get back online.
Once back online you can use the update utility to find the drivers for you. Just set the update utility going but put the settings at 'Check for updates but let me decide whether to install them', that way you retain some control about whats being put on your computer. When the update utility say's it's found updates you'll need to see what they are and tick whichever boxes you need..
2.
This way is a little harder..
Again you'll need to get back online unless you were given a driver disk (you could ask the supplier of the pc if they could supply one). You now need to know which component you have fitted where e.g. if you have a graphics card you need to know the name of the manufacturer so you can go to their website and download the drivers. The trouble is, if your unsure of the makers name then it starts to become difficult. So just to get you going perhaps the first method is the way to go..
Any problems please post back..
Fingers crossed you can understand my 'babble' lol
Edit:
I thought these sites may help:
http://pcsupport.about.com/od/fixtheproblem/ss/bootorderchange.htm http://www.computerperformance.co.uk/vista/vista_install.htm Good luck..