Feel free to run XP if you like, OP. After all, you're in good company:
- UK Border Force
- NHS
- Several very large legacy airlines
- Eurocontrol
Firefox, Google Chrome and MS Security Essentials are all issuing updates / virus definitions for XP for the next couple of years.
I note that in the past 6 months, despite XP having a ~15% marketshare the internet hasn't been destroyed yet
You doing so won't make a jot of difference. Nevertheless I would stay away from online banking / shopping on that machine though.
(it could be worse. UK's nuclear subs
run a mix of 2K and XP, and bits of the R.A.F. are still on NT4...)
If you want to replace your OS with a supported one (good idea), candidates include:
- Server 2003 R2: XP interface (if you enable Themes), supported until next July
- POSready 2009: XP interface (if you install the Luna theme), supported until 2019
- Windows Thin PC: lighter version of Windows 7