What cleaner and antivirus app should i use

the pop up is most likely false arising from an app developer that wants to market his app to u. if u really want an antivirus then avast is good enough

probably not unless you put it there

This is very likely related to another app on your device that's not behaving. If you can recall what other apps you've installed recently I'd take that new one off and restart the phone. If you're still having trouble try using an antivirus for your phone. I recommend Avast. It's free and runs well.
Mobile Security Antivirus Android Apps on Google Play

it is because your internet isnt property connecting, you may need to wipe your phone

Possible that PC is hanging up as there is fault on the OS ( operating system) . So open the internet options in the browser and clean all the cookies, temporary internet files, defragment the drives and RESTORE the PC to an earlier set date.

You can use a registry cleaner like Advanced system care. Download from the site and check you system for corrupt files. Also use a good antivirus software which is active to keep your system performing without an attack on the OS. Remove all unnecessary programs installed which you do not use all the time and clean up the drives. This will free up the space and make your system faster.
If there is no response but the PC tends to work slower and occasionally hanging when a program is being executed then you might have to install the OS once again. Install the OS and then an antivirus before the drivers of the PC is installed.

Microsoft security is an antivirus program. Yes, if the antivirus has expired it no longer protects the pc and it has became infected. No, it's not part of Windows, of any one of them. What you had it installed when you purchased was an reduced functionality one that was offered with a rebate and the licence for it has expired after an year.
Since the system is now fully infected you must uninstall the expired antivirus and install a new one. This one is free for home use
http://www.avast.com/free-antivirus-download

may be its effected with the virus, get a good antivirus like "Microsoft Security Essentials" installed in your laptop. this antivirus is free for download but work only on registered windows so be sure that your windows is registered, then install this antivirus after it is downloaded and update it. after that, do the full scan. hope it will help

First.. install a different antivirus program while you are fixing this installation. Try microsoft security essentials or AVG.
Then.
Check your program files folder for any mention of Avast, and delete it.
Run a search for avast and delete anything you find.
Download a registry cleaner, I use CC Cleaner.
Run the cleaner and remove all the files it finds, run the registry cleaner and let it delete all the problems it finds .
IF you want to try with avast again, uninstall the other antivirus program you may have installed. then try with the Avast again

I have seen alot of problem/posts concerning HP AIO's and software issues. Typically some of the functions won't work or not recognized by solution center. Try a complete uninstall of all associated printer software, run registry cleaner if you have it, restart, then try completely uninstalling your Antivirus/firewall software. I have seen that just disabling Antivirus/firewall still causes faulty installations. Now, reinstall your printer software/drivers and connect cables only when told to do so. Some reason the AV/FW software blocks some of the AIO's apps from completely installing.

Hope this works...Good Luck!