My computer blew up and I've lost the install disk, loathed to buy W7 when I have a perfectly good licence. Tried and faild to download by torrent , dodgy anyway.

Will pay for trouble in cash or 360 bits.

I only have a 32 bit sorry

Do you have branded PC or homebuilt?

PC manufacturer might send you one free if it is not homebuilt.

I don't know if media is still available from shops by order, usually media (that is cd/dvd) is available to buy separately for longer period of time than actual windows version.

Microsoft did move at least all volume licensing software to download only policy some years ago in here, don't know if individual can get registered and access to downloads license grants permits to.

I think that I have currently only XP 64 bit release canditate image, oem has own kind of code so it will no help you, can't remember if company had access rights to oem XP 64 media, I think it was only volume license, so close but no burger, sorry.