avast free failure to launch

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hey Yall  my first post!   Ive had avast free for years however it is not working now at all... sometime a while back it didnt update correctly.. Ive run the avast clear and installed latest avast version. it d/l the installer and shows up in add/remove but not in start/all programs... If I go to add/remove I can see avast and choose change or remove   upon choosing change I do the fix/repair and it says Sucess! same theing when I choose update it shows new files being installed.  however avast doesnt show in all programs or in icon tray
so what to do now?   thanks

[Asyn]

- Which version of Avast Free..?
- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

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18.1.224.0 version   Windows XP sp3  I have always used avast but sometime ago it just didnt work anymore the installler d/l but I have no UI in tray and program is not listed or running

ohhh btw these dad gum numbers that are scrambled to post are very hard for me to see

[Asyn]

18.1.224.0 version

Update to the latest version (18.6.2349): https://forum.avast.com/index.php?topic=221320.0

PS: Captcha is only needed for your first 3 posts. (Spam protection)

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ok just went to add/remove programs selected Avast then change then update  it only took a few seconds and says SUCCESS
version 18.6.2349     nothing changed      so I did same thing and chose repair,  it does it's thing showing removing and installing etc.  the last thing I saw was starting user interface and program start up     nothing chnamged! It didnt ask for restart but Im fixin to do that    thanks

[DavidR]

A restart should always be done after a program update and we (on the forums) tend to suggest a reboot after an Avast Repair.

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thanks for your help thus far.  I did a restart and it hung up for about 15 mins   so I powered down then started, went to add/remove, brought avast and clicked change... modified then it asked for a restart.........that restart went smoothly about 4 minutes total   BUT still same ol thing    I rt clicked on a picture and chose scan....... an error box came up and said
AVASTUI.exe is currently not running, please run the application before starting a scan
it's like I have it but, I don't    in search for AVASTUI.exe comes up no results

[DavidR]

Do you see the Avast Tray icon to the bottom right of the XP screen ?
See attached image of mine on an XP Pro SP3 system.

Do you have your desktop icons displayed, I normally don't, but there should an avast desktop icon.  That should launch the avastUI.exe, assuming that you do have it.  It should be here C:\Program Files\AVAST Software\Avast\AvastUI.exe.

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no I dont have it in icon tray and also it's not in location you suggested.. Im going to attempt a screen shot picture once I figure out how to attach

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Having the exact same problem. Have attempted most of the fixes mentioned by write.me

[Asyn]

-> https://support.avast.com/article/Troubleshoot-Antivirus-UI-Failed-load

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I ran services.msc and the two you mentioned were set to manual........I changed to automatic and did restart
 still no avast UI    after reboot I went back to services and the two were on automatic startup
I saw AVAST in services and clicked on it and saw that it was stopped   so I clicked for it to start...   a windows progress bar came up like it was loading      Then I got a windows error 1053 or 1503 that the application would not respond in timely matter
still no avastUI or any kind of AV service

[Asyn]

Let's check for an infection...

Start a topic in V&W and post your logs there: https://forum.avast.com/index.php?action=post;board=4
Instructions (basic diagnostic logs): https://forum.avast.com/index.php?topic=194892.0

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thanks
 just to let you know I saw someplace to hit repair avast in control panel  add programs..........so I did that again and it always removes, extracts, and adds file. then says success!!!  same with update  still no Avastui.exe    . either before or after reboot
Im tired