After having my yearly subscription end, I downloaded Avast once again and every time I try to open it, it says:
“The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log for more detail.”
I have no idea what’s going on and I have re-installed and rebooted it many times but still no luck. Any and all help will be appreciated. 
Oh, and I have a Windows Vista 64bit if that’s helpful. Thank you.
Download & install: http://www.microsoft.com/downloads/details.aspx?FamilyID=9b2da534-3e03-4391-8a4d-074b9f2bc1bf&displaylang=en
Will this help?
http://forum.avast.com/index.php?topic=56366.msg475772#msg475772
http://forum.avast.com/index.php?topic=59220.msg500384#msg500384
http://forum.avast.com/index.php?topic=54757.msg465614#msg465614
http://forum.avast.com/index.php?topic=58629.msg494150#msg494150
Thank you for your post.
I have tried downloading that and every time an error occurs.
" Error 1935.An error occurred during the installation of assembly ‘Microsoft.VC90.TL,version=“9.0.210228.8” /publicKeyToken=“1fc8b3b9a1e18e3b”,processorArchutecture=“x86”,type=“win32”’. Please refer to the Help and Support for more information. HRESULT: 0x80070424. "
I also have a problems with windows update, with the error code, 80070424. So I think these two are somehow connected. Any more help would be appreciated.
You’re trying to install the 32bit version on a 64bit system… 
Here’s the link for the 64bit version…!
http://www.microsoft.com/downloads/details.aspx?familyid=BD2A6171-E2D6-4230-B809-9A8D7548C1B6&displaylang=en
asyn
I tried both of the suggestions you gave me and…no luck :-\
This should help:
http://social.answers.microsoft.com/Forums/en-US/vistasecurity/thread/cad8b8dd-56f1-43f2-b68d-bcba8999e1be
asyn
Nothing has worked so far but thank you for your post anyways
You’re welcome…!
To solve this, please post/ask in the MS forum, I refered to in my last reply…!
asyn
thanks, but all that just reiterated my problems. AVG won’t install, neither will Avira. what gives???
Please keep your answers to the topic you started…! Thanks…!
asyn
my bad… i’m juggling all this bad advice between 2 different tabs and i accidentally posted here.