OK, there are there, but how do I get them into my wallet? I am using a diffrent computer than the one that generated the address that I gave the sender. How do I enter that address into my wallet? It only generates new ones.
You are doing it wrong.
When you start the Bitcoin client it automatically create a wallet.dat file in that pc. And it give you addresses to allow other people to send bitcoins to you.
Everytime you receive bitcoins, they are put in the wallet.dat file.
Then you can send them to others as you wish.
If you use ANOTHER pc of course you have to manually move the file and put it in the right place (roaming/bitcoin) in the new pc. So it can use the bitcoins inside that wallet.dat
You must make sure you never lose the wallet.dat that contain your bitcoins. If you for example received bitcoins on another computer too, you will have 2 different wallets with bitcoins in them. Well either move them in one of them or make sure you don't mess and lose with them
So if the PC that generated that key is dead, I will not be able to retrieve them ever?
What do you mean with dead? Your pc happily died after a day?
Well if you lost the wallet.dat file yes you lost your bitcoins.