If you know where you keep all your important files then it should be pretty easy to transfer them to your new computer. You should browse through all your folders to make sure you don’t miss anything that you may have put somewhere and forgotten.
If you want to make sure you didn’t miss anything than you can search your computer for certain types of files that you commonly save. For example you can search for *.docx to find any files that end with .docx which is the file extension for Word documents.
Once you know where all your files are you can determine the best way to back them up to transfer them to your new computer. You can do things such as burn them to a CD or DVD, copy them to a flash drive or external hard drive or even copy them over the network if your old and new computers are on a network. You should first decide where you want to put them on your new computer before copying them over to it.
As for programs you will most likely have to reinstall them from the installation media. Most Windows programs can’t be copied over from one computer to another without being reinstalled. There are a few exceptions though. It’s a good idea to make sure you have the original installation CDs for any software you want to have on your new computer. It’s also a good idea to make sure the version of your software will work with your new computer’s version of Windows.
Another thing you should copy is your favorites/bookmarks from your web browser. Internet Explorer has a built in import/export feature as do other browsers that allows you to save your favorites to a file and then import them on your new computer. You may also have some files on your desktop that you will want to copy over to your new computer.
You should also keep in mind that you will have to obtain drivers for items such as printers etc. to work with your new version of Windows so you may want to get those beforehand and make sure the device is supported.