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Win 7 OEM Install on New HDD (HP Laptop)
If your HP PC or laptop dates back prior to December 2010 and you have to replace your failing (or failed) Hard Drive with a new one, you may run into trouble reinstalling your operating system properly from the OEM recovery disks (if you have them). You can get replacement OEM recovery disks from HP for a small fee but these will be a problem installing as well. Your OEM may be willing to support you for a fee, but that probably won't be necessary.
Your new SATA HDD is probably using the Advanced Format which uses disk space more efficiently (something about 4k sector sizes instead of the old 512k). You can waste a heap of time pulling your hair out because the OEM version may load but won't update and won't network properly.
Go to this link
Intel Rapid Storage Technology Driver | HP® Support
to download and install the "Rapid Storage Technology" driver "sp5138.exe."
Then have fun updating for the next two days :)