|Check to see if the recovery partition is still intact. If it is, that's how you can reinstall XP. Or you can try installing using a retail disc & the product key you have. As stated above, if it doesn't work, call Microsoft & they will activate it for you.|
But being that XP is outdated, no longer supported, & a security risk, you would be much better off learning to install & use Linux on your older systems. It's 100% free & almost impossible to infect. Post the specs of your dv4000, especially the RAM amount, & I can suggest a couple of Linux distros to try. I put Zorin OS 9 Lite on my zv6000 with 1.25GB RAM & it runs decently. And I just put Zorin OS 9 Core on a friend's more modern laptop (Core i3 with 4GB RAM) & she loves it. It's very windows-like so it's an easy transition. If you can figure out Android (which is based on Linux), you can figure out Linux.
message edited by riider