I was using Windows XP SP2. But softwares' update version do not work with it. So, I have download Windows XP SP3. But it is not written in a CD. Can I set up Windows with a pen drive? If so, then how?
Please reply.

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There are two different problems under the same question: applying the SP3 update to an existing XP install, and doing a clean XP installation from removable media. pointed out that those need different approaches; the short takeaway is to pick the path that matches what was actually downloaded (an update package versus a full install image).

If you have the standalone SP3 updater, the usual, least‑risky route is to verify the download, make a full backup or system image, then run the SP3 executable from within Windows with administrator rights. If the installer fails, check free disk space, Windows Update/log events, and temporarily disable third‑party security software. Verifying the file hash or digital signature helps rule out a corrupted download.

If you need a clean install from USB, prepare for a few XP‑era quirks: create a proper bootable USB using a tool that explicitly supports Windows XP installers (tools such as Rufus or WinSetupFromUSB are commonly used), make sure the target PC can boot legacy BIOS/CSM (XP does not support UEFI-only boot), use a USB 2.0 port, and be ready to deal with SATA/AHCI drivers. A common workaround is to set the motherboard SATA mode to IDE/compatibility, or inject the AHCI/storage drivers into the XP install source (slipstream) before building the USB. Slipstreaming SP3 into the install source can be done with the updater’s integrate switch, for example:

windows_sp3_installer.exe /integrate:C:\XP_SOURCE

Finally, on modern hardware XP may be impractical because of missing drivers (USB 3.0, NVMe, UEFI-only motherboards). In those cases running XP in a virtual machine (VirtualBox/VMware) is usually faster and more reliable than forcing a native install. Also confirm that you have a valid license before installing.

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If you mean that you downloaded the whole Windows XP SP3 OS then you won't get help with installing that on this site. If you downloaded the SP3 upgrade file, KB936929-SP3-x86-ENU.exe, then yes, you can install it from a pendrive. But why not copy it onto your hdd first?

If you mean that you downloaded the whole Windows XP SP3 OS then you won't get help with installing that on this site. If you downloaded the SP3 upgrade file, KB936929-SP3-x86-ENU.exe, then yes, you can install it from a pendrive. But why not copy it onto your hdd first?

Yes I have download the hole Windows XP SP3. Ok , I will copy it into a hard drive.
Thanks.

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