Mac Specs: MacBook Pro 15, 1Gb RAM, 100GBHD, 2 Perfoma636CD, Apple, Apple IIe, + 2 PC, XP Pro 64bit, & ThinkPad
over a network is all I can think of. Why such an old machine, and why from mac to windows xp. most people here are going the other way. Generally that is what is implied in a switcher forum, in a mac site.
Mac Specs: Mac Pro, 3.2 GHz 8 Core, 8 GB RAM, 2*750 GB Disk, nVidia 8800 GT
Perhaps your old Mac has Firewire? If so, you can use an external hard drive, or if you are going to a new Mac (hint hint) then you might be able to use Mac to Mac transfer over Firewire, although I am not sure if this is supported pre OS X.
If you don't have firewire, and no external drives of any sort, you are stuck with either (a) internal network, or (b) use of one of those Web based storage mechanisms like .Mac or box.net, where you can stash your stuff up on the web and then pull it down to the new machine. Typically however, this will be painfully slow, since most DSL high speed internet links are much slower on the uplink than the downlink.
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My Macs: Mac Pro, 3.2 GHz 8 Core, MacBook Pro, 2.2 GHz C2D
My iStuff: 32 GB iPhone 3G S, 30 GB iPod Video, 16 GB iPod Touch
My OS': Mac OS X Leopard, Mac OS X Tiger, openSUSE 10.3, Win XP
I was on the Mac-Forums honor roll for September 2007
Mac Specs: MacBook - White: 2.0GHz Intel Core 2 Duo, 2GB Ram, 80GB Hard Drive, Double-layer SuperDrive
You have to set up sharing on the Mac machine and then you will be able to retrieve the files on the XP machine. If that version of the Mac OS doesn't support Windows file sharing then I recommend running perhaps an FTP server or Web Server and retrieve the files that way.
You might try searching around Apple Support, I've been looking and there is a thing or two. But I have to go, when you search remember your key words are 'windows', 'network', and '7.5.3', ad 'mac' for the google search