I tried uninstalling and reinstalling - uninstall worked fine but the same problem occurred when trying to reinstall, so now I have no virus protection.
Checking my storage I have 17.96 MB available on internal SD card and 16.92 MB available on internal storage.
Any suggestions on how to fix the problem?
Best answer by pegasView original
If an Android device is rooted it's possible to use App2SD to move the entirety of all apps to the SD card however this can cause alot of issues with the Android OS itself if the SD card is either removed or changed and has the potential to 'brick' the device.
There are pros and cons to both ecosystems.
To move apps to the SD Card, go to the global Settings menu, then go to Apps or Applications. Tap Manage Applications, or, if your device has it, "Storage Use" if you want to see the biggest ones.
When you tap on a specific application on the list, it -MIGHT- have the option to "Move to SD Card", usually the right button on the second pair. Not all apps can be moved to the SD card, and not the entire app gets moved with those that can, but going through all the apps and moving the ones that can is often a benefit.
Small Internal Storage will always be the bane of smart devices. At least I can say I have 1.2 GB, but at the same time, compare that to an iPhone with 16 GB and it's somewhat meh. Thankfully the 16GB SD Card holds all the music and photos, but still...
I am not sure you can install WSA on a SD card. At least in my case I can't do that. I rather think it is not possible since WSA as a security application needs access to and/or handle Android system files.
Your problem seems to be indeed related to insufficient space. I think that cca 18MB available is too low. In my HTC Desire S WSA takes 7,33 MB so we can draw a conclusion that during installation WSA counts space available and if it is low it rejects to install with a prompt you have seen on your device. However I don't know what a minimum space available is required. It needs to be clarified by webroot techs.
In the meantime please try to clean your space a little bit more to see if that is of any help.