New PC Won't See Hard Drive

[endo]

So, my older PC finally died. I had had it about 7 years, and had done everything possible to it, lol.
I maxed out the memory, added a new video card, new sound card, power supply, you name it and I probably replaced it.
But, it finally died completely.

So, I bought a new PC that is built mainly for gaming, and it has Win 7 64 bit on it.
I know a fair bit about PC's but, I can't seem to install the HDD that was for pictures, music, videos, etc. from the old PC in the new PC.
I get it in and connected, but for whatever reason the Win 7 PC doesn't see it.
I have a lot of stuff on that drive that I would really hate to lose.

Anyone know how to get the Win 7 PC to recognize the old HDD?

Thanks.

Looking for your help here, Gothiclord, lol.