seticat | Looking for software

Looking for an install disc and reg # for XP Pro, SP2 or SP3. I googled eBay and Amazon and had a stroke. I still have my husbands old laptop - a little Acer 15" - and it's got Vista loaded on it. The poor thing slugs out so badly it's little better than a door stop. I don't want to do a lot on it, mostly word processing, email and such when I travel, so I'm loath to dump a lot of funds in it. I'm running XP Pro SP3 on my main laptop and have it on the desktop [if/when I get that up and running].

Sorry folks, but I don't want to load Linux, Unix, etc. I'm just not all that experienced with them. I just want something that will be compatible with the software I've already got [and I'm already using Open Officer for my WP suite].

Anyone have any clues or hints?