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Yes, I have been able to make a portable WinXP on a USB HDD before. But although I think I used UsbBootWatcher that time, now I failed to boot the system, I get BSOD 7B. And the instructions in my link are for Win Vista+. WinXP should be done differently, first it should be installed as usual on another computer on HDD, then it should be configured to boot from USB (you should look for more options), then the partition should be cloned to a USB flash drive.

WinPE is not designed to be fully functional, so the drivers may not work there either. You need to install a full system, and to boot it from USB, use UsbBootWatcher: https://github.com/vavrecan/usb-boot-watcher

I've never used the installer, so I haven't even checked to see if it works.

CPU-Z 2.11 works again in Windows XP.

It is necessary that the device knows how to use the received data, hardware codec is not much different from software codec. If a software codec doesn't support the format, there is no way to make it support it, except updating. If you make the data to be processed so that the device understands this format, but this is already a software decoder, and the conversion will be done by the CPU.

Yes, especially since there aren't many suitable graphics cards, which further reduces the number of suitable systems. XP x64 itself is a stable system, after all it is made on the basis of Server 2003, but there are problems with drivers, so the stability depends on the hardware, on one computer it can constantly glitch, and on another will work more stable and faster than XP x32. If you set the "Enable CUVID DXVA processing" checkbox, nothing changes in LAV 0.70, I don't know if anything is enabled at all, because although this version officially supports XP, it doesn't have DXVA1, only DXVA2. In LAV 0.79, enabling CUVID DXVA breaks every video into artifacts.

I didn't take screenshots because everything is the same as in the previous test, acceleration with Cuvid. DXVA as in XP-32 does not support h265 at all.

Continuing my hardware acceleration tests on the GTX950. I have now installed Windows XP x64, LAVFilters-0.70.2-x64, the latest officially supporting XP, video driver 368.81, MPC-BE 1.7.3 x64, the new MPC-HC x64 I couldn't make work, and there are no other x64 ports, so I'm using version 1.7.13 x64. Hardware acceleration seems to work better in x64, there is no problem with h265 the first time, everything works, but the h265-10 bit doesn't work either. VP9 also works, but for some reason very low fps, only 10-14 frames, although neither CPU nor GPU are heavily loaded.

About LAV - it seems that because of K-Lite there were such settings, reinstall LAV, cleaned the registry from it, now VC-1 is enabled, but MPEG-4 is disabled.

Most likely it was used at the dawn of the BD era, I've seen a lot of BD disks, and they always use h264, or h265 if the video is 4k. Although, according to Wiki, some studios encode more in VC-1, but apparently I haven't come across such disks.

Something is still wrong with h265, after rebooting the system the video crashes again with artifacts, even though I haven't installed or changed anything, neither in the players nor in the system.

In LAV 0.70 hardware acceleration is disabled for most formats, it's not clear why, maybe K-Lite set it that way, I installed it. And you are confusing VC-1 with AVC (h264), this is the codec used in BluRay disks.

VC-1 is supported, it's just that it's disabled by default in LAV, I don't have any videos in that format so I didn't turn it on. I checked in older versions of MPC, where there is VMR, the video also crashes with artifacts. Looks like the problem is in LAV itself, apparently this version doesn't work properly in XP. I downloaded unofficial LAV 0.79.2, it's much better, artifacts happen after starting the video, but disappear after a few seconds. But hardware acceleration works only in 8 bit h265, 10 bit is not accelerated. To make it work, you need to disable h264 and h265 codecs built into the player, as well as disable mkv, webm and mp4 filters, and add external filters from LAV. Screenshots:

I checked the hardware acceleration on a GTX950 in WinXP using LAV. CUVID is indeed there and it works, but with h265 and VP9 there are problems, the video opens and hardware acceleration works, but the video is scattered into many artifacts, it is impossible to watch it, so actually only h264 works, no problems with it even in 4k. But CUVID only supports Nvidia GT630 and newer graphics cards, so the use is very limited. But those who have suitable video cards will be able to get hardware acceleration back on ported versions of MPC-HC and MCP-BE, where there is no VMR.

There are no separate files for DXVA in the driver, apparently it is embedded in the driver itself. AV1 and h266 require a much more powerful processor to playback, but usually, if Win XP is installed, the processor on such a computer is quite weak. And AV1, h266, VVC, they are all designed for streaming video, they have much less fine-tuning than h264 and h265, they blur the video more, there is more loss in dynamic scenes, and the main thing is that it takes many times longer to encode video. I meant hardware acceleration, h265 is of course played using the CPU, so are all the new video formats. Decoders and encoders work like this, they use the most supported instructions from the set of possible instructions, it's just that for newer codecs, the minimum may be SSE4.

No, h265 is not supported in Win XP in any form, probably they just didn't add support to the driver. Maybe he means that h265 requires DXVA2, which Win XP doesn't have either.

I doubt very much that NVDEC is in the drivers for Win XP. PureVideo, depending on what it works through in Windows, if it is DXVA, we already know the result.

It probably uses the I2C bus, so you can't see the touchpad. I don't remember if there is a driver for 6th generation processors. Write the IDs of unknown devices in Device Manager. Try SDIO, just don't install the I2C drivers from Windows 8 and 10, they drop Windows 7 into a BSOD.

But Firefox 128 is a normal browser, it's up-to-date, just softpedia protection is overdone, I get such sites that show captcha on any browser, maybe they react to my IP.

It probably depends on how much protection the site owner has set up. I also got captcha on Waterfox and Firefox 128 ESR.

I have it open, Supermium 126 R2, Win XP SP3, I have not changed the user agent.

If you mean hardware acceleration, nothing in Win XP supports it. Nvidia has no h265 support for DXVA in its 700 and 900 series card drivers for XP, Radeon has h265 support only in RX400 video cards, for which there are no drivers for XP at all.

It's weird, not supported in XP but supported in 2003, and I've seen the opposite, not supported in 2003 but supported in XP. Why didn't they synchronize it, in fact XP and 2003 are the same system, albeit on an updated kernel.

Thanks, sent the error report to the email. Oh indeed, works on XP x64, apparently they added that system call in it.

CPU-Z 2.10 does not run on Win XP. The last working version is 2.09. But the discontinuation of XP support has not been announced, so it's a bug, but I couldn't find how to inform the developer about the problem, there is no forum or feedback.