Third, run a disk check to verify that file system is not corrupt. The simple move might fix problems with locked files and make everything right again.
There are options for quickly fixing Windows Update problems or completely reinstalling it in Windows.
Keep in mind that, by default, the Windows Firewall severely restricts inbound traffic to an SP2 system.
This restriction might prevent remote management, disrupt peer-to-peer networking, block FTP or Microsoft IIS connectivity, prevent browsing on new integrated installations of XP with SP2 (File and Print Sharing isn't enabled by default), and cause a host of other connectivity problems.
All in all, most modern PCs running NT 4.0 or 2000 should be easily upgradeable to XP. Unlike the 9x/Me upgrade, the NT/200 does not offer any uninstallation capabilities, so it's a one way street: Once you begin the upgrade, the only way back to your previous OS is to wipe out the hard drive and reinstall from scratch.
For this reason, I advise carefully backing up your files and settings before proceeding with the upgrade.
Now that Windows XP Service Pack 2 (SP2) is available at Windows Update for online update of both the XP Home Edition and XP Professional Edition platforms, you need to be prepared for the changes you’ll see as a result of the security controls XP SP2 installs and activates by default.
A query of Microsoft's XP SP2 Knowledgebase articles posted during the past 2 weeks turned up a laundry list of installation and device-related bugs, information about the affects of the now disabled Alerter and Messenger services, problems related to the enabled firewall, third-party network backup, and other application problems.
Windows 8 (not 8.1) stopped receiving updates after 12th of January, 2016.
Despite Microsoft's best efforts to convince everyone to upgrade to a newer version of Windows, Windows XP is still running on nearly 28% of all computers connected to the Internet. If you have to continue using Windows XP, make sure your web browser is at least being updated.
Microsoft Security Essentials is free, but other security options are available — including suites from Kaspersky and others.
During the development of Windows 2000, Microsoft did all the hard work of making the NT 4.0 upgrade as seamless as possible, and this work is carried over for XP.
For 2000 users, the upgrade is even simpler, because there are relatively few changes under the hood.