So, this happens:
I had Avast installed before but I removed it and now whenever I try to reinstall it I can’t. All I’m trying to install is Avast itself, the Software Updater, and the File Shield.
Please help!
Thanks,
M260.
Get Glary tools and run the drive cleanup.
After that try again to install avast.
Also make sure that there are no remains of a previous av.
http://www.ache.nl > malware? > remove (old) av
You probably need additional space if you intend to install the new NG feature in Avast.
It sets up some virtual drives on your system which required extra space.
It’s also never a good idea to run your computer if HD space is very limited.
I don’t intend to install that, though. In fact, I don’t even know what it stands for, TBH.
Is regular Windows Disk Cleanup not enough? Because I’ve tried that already.
The only antivirus software I had on this computer previously was Avast. And that was two days ago or something, I believe.
Avast NG is a hardware based virtualization solution to provide more isolated test space.
It is capable of running each Windows process in standalone safe virtualized environment (VM)
and fully integrated to your desktop. Each process is executed in its own instance of VM,
which means totally isolated from your other applications. This feature now powers
Avast DeepScreen to improve better scanning of unknown programs (better detections).
Clean your computer… 400mb is not enough. Your cutting it way too close. No windows cleanup is not enough (tho make sure you are running as admin and select every thing). Use ccleaner or wise disk cleaner or delete some programs
How much do you need? Because it said 400mb was the minimum space requirements for Avast…
There is no rule exactly. Old school would say 10-20 % free space to have a fast system, but if it is a storage drive you do not need that much. Being your system drive the less space you have the slower it will work and eventually you would not be able to execute anything in it, or in this case install anything. Programs need to open to work right, also fragmentation plays a role.
If the alert window is right and you only have 1.5 GB left and you are installing Avast I think is cutting it too close for confort 
You cannot reasonably run a Windows system with just 1 GB or less of free disk space. Shoot for 1 TB free, and settle for 500 GB free. Then you’ll be in reasonable shape.
-Noel
I’m running this on a tablet that I believe only has a 32GB SSD, and I have a lot of stuff on there that I’d rather not remove.
The thing is, though, Avast was working fine before I uninstalled it, (and then tried to reinstall it soon afterwards,) and I’ve been able to install and run other programs fine, so…
With todays SSD you do not need to have that much free space, but still you need some for the system and programs to work.
If Avast was working before and the new Avast give you this alert you need to review Bob3160’s advice above ( Reply # 2 and # 4 ). Run avastclear.exe and then reinstall Avast choosing Custom Install. In Tools uncheck NG.
Sorry for the late reply but I just tried running Avast Clear and it didn’t help…,
Please run the glary tools as I suggested and let us know how much free space you have after running the disk cleanup.
Let’s take it from there.
So, I tried downloading Avast 2014, (which I had installed before,) and it installed without a problem.
It seems it’s Avast 2015 that my computer’s having problems with.
Did you choose custom installation ? Did you uncheck " NG " ? Check Bob3160’ video on How to install Avast!
http://www.youtube.com/watch?v=1kTqm7P1KtU&feature=youtu.be
Remember we are working on the assumption that there is no freespace left for Avast 2015 to install NG.
Yes, I already said I unchecked everything except File Shield, Software Updater, and the English language.
You need to start considering that you cannot do anything useful with a Windows system with less than 1GB of free space on the drive. It’s no one’s fault but your own that you bought a system with too little space to be usable.
-Noel
Agreed. Something in Avast 2015 does detect that you are going to have less than 1GB free space in the SSD after installation and is warning you.
Same thing happened to me, older system, Windows XP, 14GB partition, 1900MB free.
Custom install, File & Network shield, English language. Would not install, same error as above.
Reverted to avast 2014. I opened a ticket with avast, asking if this was an installer error.
The response was unintelligible, asked me to run the default install and not to customize it at all.
Sounds as if the responder had not read/understood the point at all.
Did you guys not notice “MASTER260” had 1.2GB free that is heaps to run an installer. I had 1.1GB free and it STILL SAID NOT ENOUGH - well that is crap - my machine runs just fine with 500MB free because it is tuned and runs a lean custom win XP OS setup. Avast seems to be coding check 10% of drive free instead of checking 400, 800, 1GB free or whatever min free space is really needed. I had to clear 3GB just to run the installer and it only used 386MB, so a 4TB drive will need 400GB free just to run the installer? That is unbelievable overkill and stupidity IMHO. If you want to be this specify it on min system requirement section so we know exactly how much space REALLY needs to be free to run the INSTALLER. If AVAST is coding 10% of drive free say so in product specs.
You probably loose customers for forcing a 3GB minimum there, as their are other AV products that provide a smoother install experience and don’t need 3GB of free space.