Avast wont start up or uninstall?

Hi im noob soo… anyway I’ve got avast home on win xp sp3… I dont know if it was b4 or aft xp updated but avst wont open or uninstall or update?? pls help :-\

Try a clean reinstall:
Download the latest version of avast http://www.avast.com/eng/download-avast-home.html and save it to your HDD, somewhere you can find it again. Use that when you reinstall. Ensure that you scroll down and select the avast direct download link for the English version and not Cnet as that is for an on-line installation (not what you want to do).

Download the avast! Uninstall Utility, find it here and save it to your HDD.

    1. Now uninstall (using add remove programs, if you can’t do that as you mentioned, start from the next step), reboot.- 2. run the avast! Uninstall Utility, reboot. If step 1 failed it may be necessary to run this from safe mode, once complete reboot into normal mode.- 3. install the latest version, reboot.