Besides being involved with vintage drums, I'm an A+ certified computer technician. My last job, until the "great recession" was as a tech for a local K-12 school district. I'm currently upgrading quite a few of my clients from XP to computers with Windows 7. Please don't get me started about the love/hate relationship with W8!
What all the other posters have said is true. Your reliable XP computer will not go up in flame with the next boot up or anything like that. XP has been one of the best OS's that Microsoft has come out with, evidenced by its 12+ year run!
Like all other OS's before XP, you can continue to use it for a good 6 months or more with no real issues. Just be sure you are fully patched and NOT using Internet Explorer to surf the web. Why? Because IE for XP can only run version 8. IE is currently up to version 11 for W7 and W8 and is, in fact, a good browser. With XP, please be using either Firefox or Chrome and be sure it's the latest version.
Make no mistake, while 99.9% of holes in XP have been patched, it only takes one hacker to discover that .1% and take advantage of it. However, this is true in ALL current OS's. Just use good judgement when surfing the web and downloading suspect files.
BTW, be sure to have a good Anti-virus program, too. Since MS is also discontinuing support for Security Essentials, a good, FREE alternative would be Avast. This is what I'm currently installing on many client's computers. Works great and won't put a burden on your resources.
Nice to know we can also post about other important topics, other than our beloved vintage drums!
-Mark