Hello,
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this is a test.
Many volunteers are ready to help you. However, there is some confusion with information you gave in your post. It is possible to connect two computers together with a crossover cable. However, this does not involve the use of wireless. If you have a wireless router, you must use the wireless router to provide connectivity between your computers.
This is the way it would normally be done. Most computers should already have some way to get access to the Internet. This would be through a router that is connected to some external device that gives you connection and the Internet. Next, you have to establish a local area network. The local area network have to be set on each computer.
You must set up a network connection on both computers. Even though you already have Internet connection, that does not define the local area connection. The local area connection must have a workgroup name and a name for each computer. Both computers should use the same network name, but each one has its own specific name to identify that computer.
You might call your Vista omputer V isata-1 and the Windows 7 computer could be called Win-7. Both computers should use the same workgroup name. You can use the name MSHOME as the name of the network.
It may be necessary to reset both computers after assigning the workgroup name and the individual names of the computers. It may take a minute or two for the computers to find each other. This is normal the first time.
After a while, you should be able to go into network places and see both computers. Of course, you must have file and print sharing already enables. A common practice is to share a folder such as the one called public. You want to set up your system so that either computer can read and write shared files.
Use of a crossover cable is seldom recommended, except for unusual circumstances where you're not able to establish a network on a computer. The use of a crossover cable is documented elsewhere. If you already have a wireless router, there is no need to use a crossover cable to connect two computers. In fact, use of a wireless router allows you to connect many devices other than computers. For example, a smart phone or a tablet can also connect wirelessly and in some circumstances even trade files with the PC. And even if not, there are programs and applications that do allow you to transfer files between tablets and PCs either through the local area network or using a server on the Internet.
I hope this information if you some idea of what you want to do.