I think I messed up my Hard Drive, should I replace it?

Hey everyone, I think I might've goofed up my hard drive. My Sager NP5170 can not reboot Windows 7, and I can't figure out why. When I tried, it tried installing (not reinstalling) to the HDD, and now every time I turn it on it asks me to put in the information, then it's somewhat fine (screen resolution is a bit messed up), but I also can't get online and it asks me to update my drivers, but I can't do that since I have no disks and because of the internet issue.

So I'm thinking of taking out the current 500GB hard drive and replacing it with a 1TB (Or maybe the 750GB WD Scorpio Black) and just booting Windows 7 onto it. I'm not entirely sure if there's a boot drive that's causing the problem, but from what I've read, there isn't.

What would you guys recommend?
Thanks.

You didn't state the brand of hard drive you have at this time. I would go to the maker's web site and download their hard drive diagnostic ISO file and burn it to CD disk. Boot from the CD, and have it run the extended test to find out whether the drive is bad or there is some other problem. It can take quite a while to run this test, so be patient.

Also you can use the system repair disk if you created one, to try statrup repair and see if it can fix the boot files on the hard drive. If you have not made one, you can use one from another computer running the same version of Windows you have. You may need to run the startup repair 3 times with attempted reboots between each repair attempt.

My apologies. It's a Seagate Momentus 500GB. I managed to get it working, but now I'm having some update issues.
Microsoft NET Framework 4 (KB982670). I tried running a hard drive error diagnostic, but I can't run it without NET Framework. Not sure what to do.