Antimalware, firewall, and other security programs for Windows XP working in 2023 and hopefully beyond

[AstroSkipper]

On 1/23/2026 at 4:37 PM, AstroSkipper said:

Here are some facts about the sizes of SUPERAntiSpyware's virus definition files from 2024 to 2026:

SASDEFINITIONS.EXE 210,345,304 bytes 07.07.2024
SASDEFINITIONS.EXE 214,737,232 bytes 27.05.2025
SASDEFINITIONS.EXE 353,800,400 bytes 23.01.2026

The virus definition file SASDEFINITIONS.EXE has increased by 4,391,928 bytes from July 2024 to May 2025, which is a normal increase of approx. 2% within 10 months. From May 2025 to January 2026, however, it increased by 139,063,168 bytes.  This is an unbelievable increase of approx. 65% within only 8 months and definitely a no-go.   The file has become totally bloated for whatever reason. Now, I finally know why the download takes much longer time than before, apart from the catastrophic download speed on their update server, which is used by the programme.

Interestingly, and as if this company had read this post, the following happened:

SASDEFINITIONS.EXE 345.6 MB 07.02.2026, but then
SASDEFINITIONS.EXE 229.4 MB 15.05.2026

Unfortunately, the virus definition file SASDEFINITIONS.EXE was inflated again in July 2026:

SASDEFINITIONS.EXE 305.8 MB 26.07.2026

Very strange what on earth they’re up to there.   

My guess is that the definition files and their installer are compiled extremely sloppily. 

Edited 1 hour ago by AstroSkipper

[Dave-H]

1 hour ago, AstroSkipper said:

Which version are you currently running? 22.03.05? And do they still offer a more recent one for paid customers? And what about their support? Have you got any reply that Panda Dome is working again on Windows XP? 🤔

I'm running 22.03.05.
There is a more recent version 23, but it appears that isn't XP compatible, as if you try to install it on XP, you actually get 22.03.05 instead.
I had no reply from the direct Panda support people responding to the report forms I sent them, which didn't surprise me at all!
Nothing from the people at AnyTech365 either, which did slightly surprise me as they seemed to be pretty good.
They had said that they would let me know about ongoing support for XP.

[AstroSkipper]

14 minutes ago, Dave-H said:

I had no reply from the direct Panda support people responding to the report forms I sent them, which didn't surprise me at all!
Nothing from the people at AnyTech365 either, which did slightly surprise me as they seemed to be pretty good.

That’s exactly what I expected. What’s the point of AnyTech365 having friendly staff if the customer is still left in the dark? 👀