Get a mouse for the old CPU.

What format are the old files in? If they are any standard text format, then yes, you can import them to your Mac and use them. Get a mouse (as mentioned) and drag the files to a USB drive to transfer them to your Mac.

If they are associated with a recipe program, you may need to install a Windows emulator such as Parallels to use the program.

To add on to what @crisw said, it will also work if you just saved the entire web page.

There are plenty of ways to hook computers together, wifi being the most common as of late. You can also use USB drives (either a little Flash drive or a full-on external hard drive) to transfer the files the old-fashioned way.

If your recipes are mere links and you use Firefox, it is an easy matter to sync your bookmarks to any firefox browser you use. I use Firefox on my laptop, desktop, and Droid X, and all three sync history and bookmarks all the time thanks to an add-on I have.

So, tell us this: how are you having those recipes on your old PC? Links? Bookmarks? PDF? Saved page? Text/*.DOC?

What you need to do really really depends on your answer to that question.

What jerv said is the best answer I can think of. All the standard document formats are portable now. Most web browsers will let you import a bookmark file. And if you have both computers hooked up to the internet on the same network, it’s pretty easy to transfer files. I suggest using the Mac for that, because it usually has no problems reading files from Windows. The reverse is usually not true.

Anyway, you need to provide more info on how the files are stored, and in what format to get advice you can actually use. Once that is clear, the rest should be easy.