Adding storage space to dads computer, help required!

Hi Guys,

Just yesterday I installed two new sticks of RAM in the the old boys computer as well as a new 1TB Seagate HDD i will first guide you through my install proccess and what problems i've encountered.

First i replaced a single 2gb stick of ram with two corsair 2GB sticks, then added the original equalling a total of 6GB.
I then installed the harddrive in the appropriate manor and conected it to the sata1 port (main HDD with OS is connected to SATA 0) the first problem i encountered was that the computer would boot but it wasnt loading the OS so I then switched the sata cables around for some reason to see if either was faulty turns out they're both ok, tried again, didnt work, then i took the old stick of ram out to see if that would help, i figured seeing as i didnt know what mhz it was running at i thought it may have been interfering with the other two new sticks. After taking the old stick out i still had no luck.
Then i remembered that when installing new ram and whatnot, sometimes you might have to reset the CMOS so it can adapt to the new hardware. I did this, took the battery out, left it for a day, then put it back in and presto, it worked.

I managed to get into the desktop and noticed the popup on the right hand side saying it was installing drivers for the new hardware meaning that the sata cable connecting the HDD is working which was good but when i went into my computer the new harddrive wouldnt show up.
I decided i should make sure the computer has detected it so i

right clicked my computer>properties> device manager and went to disk drives,

sure enough the HDD was in there, so now i know it has been noticed, i then proceeded to check that the latest drivers were installed and they are so now im left clueless and wondering why this hasnt been recognised as a Hard Drive in My Computer?

Also, dad reckons now when he tries to access the internet via IE it says that its not genuine and doesnt allow him to use it.
Hopefully this isnt a TL;DR thread, sorry about the big list, i just wanted to make sure you knew my every step.

By the way, he's running vista, so everything will be a few generations old if that helps with anything. i dont know what hardware exactly as of now but if you think that might be an important aspect to its diagnose i'd be glad to find out.

Cheers for reading and i hope someone out there can help me.