Problem With Avast

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So today I turned on my old windows xp desktop as my laptop is in for repairs. The old  pc needed a lot of work. Had to uninstall a heap of unwanted programs, run a disk clean up and defragment. Once I did all this I noticed that avast hadn't updated since I turned it on. So I went in to the program and found its running version 6.0.1426 and wouldn't update. It was stuck on initializing...

So I downloaded a new version of the program and when trying to install I got this error everytime I tried.


I then thought okay maybe its got something to do with the older version being installed.
I went into Add or Remove Programs tried to uninstall it and this error popped up.


Not sure what to do now.. Any ideas?

[Asyn]

- Which Avast..? (Free/Pro/IS/Premier)
- XP... (32/64 Bit..? - which SP..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

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- Which Avast..? (Free/Pro/IS/Premier) Was a Internet Security Free Trial that expired last year, it wont revert back to the free version
- XP... (32/64 Bit..? - which SP..?) I think its 32? Service Pack 3
- Other security related software installed..? Malwarebytes, its also going spastic and avg did aswell when I tried it earlier today.
- Which AV(s) did you use before Avast..? Pretty sure it was avg, not sure though

[Asyn]

First, be sure to get rid of all remnants of your prior installed AV(s)..!!
-> http://www.avast.com/faq.php?article=AVKB11

Then:
1. Download Avast Free Antivirus: http://files.avast.com/iavs9x/avast_free_antivirus_setup.exe
2. Follow instructions: http://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions..!!)
3. Reinstall Avast with the downloaded installer from point 1.
4. Reboot.

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I'll give that a shot thanks mate

[Asyn]

NP, report back.