IP Question

Each machine on a network requires an individual address - like social security numbers or phone numbers. You can however use a cheap router (broadband routers under $100) which will sit with one IP address and issue DHCP addresses to your three pc's. To the Internet - they will appear as one IP address. By default most of these types of routers are preconfigured to issue DHCP - you simply connect your machines to them and they will issue the addresses you need.

Simple / Free Solutions for Windows
Microsoft provides a free internet sharing solution in Windows 98SE, ME, 2000 and XP. It is called Microsoft ICS. Learn about it here. Other solutions include:
Analog-X Proxy link
WinGate (link) - free for 2 users!

Remember, since these solutions are free; the often have very few features or support options. If all you need to do is browse the web on a few computers and check e-mail then these free solutions might be right for you.

short answer:
no.

when the computers come up, they will show an ip address conflict

The reason for having 3 PCs have the same IP was not given, are you trying to share a process among the three boxes? If so, these three box can 'share' an IP with network load balancing. Each Box will still needs it own seperate IP, but a secondary IP can be established so the rest of the network will see these PCs as a single resource.

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