connect a laptop computer people visit to my desktop via the USB cord

If I connect my laptop to friends to my computer via the USB cord so that she can get on the internet, if there is nothing wrong on my computer like a virus or something bad, he can go on to the laptop? And if I have a wireless router & it connects to the internet in this way, can get the same bad things in his laptop? I know that sounds pretty lame, but I don't have a laptop.

First of all, it is doubtful that you could find a USB bridge cable to connect two computers, and even if you did, it would be difficult to configure things to enable the second computer to access the Internet.  (But see http://www.hardwaresecrets.com/article/Connecting-Two-PCs-Using-a-USB-USB-Cable/248)

The good way to share your Internet connection is using a router (wired or wireless, any - except convenience).  But it is certainly possible for the virus to spread on a network, it is unlikely as long as each computer has an antivirus application to update and Windows Firewall (or a good third party firewall) is enabled.

If you don't want to buy a router (and note that a router is very good for you security protection even if you only have one computer), you can connect the two computers with a cable 'cross-over' (a special type of cable Ethernet) and of XP Internet connection sharing.

If you wish, you can disable 'file and printer sharing' on computers or both to further isolate them from each other.  Details vary for different versions of Windows.  Here's how in XP: http://compnetworking.about.com/od/windowsfilesharing/ht/enable_disable.htm

Tags: Windows

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    ---------------------------------------------------------------------------

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