This is my shot in the dark

I don’t know whether you did a quick format? Or non–constructive… Try a fresh install

Download Avast 6.0.1287 & the tool if you deleted it

Go into safe mode uninstall Avast using the tool making sure you pick the right version at the top.
Disconnect from Internet Reboot into Windows Do a search for any Avast that might be left over.

Then paste this in start menu’s search box------- regedit

  1. HKEY_CLASSES_ROOT
  2. HKEY_CURRENT_USER --------expand this with the + sign click on software delete Avast file if any.
  3. HKEY_LOCAL_MACHINE-------- Same with this one. Avast4) HKEY_USERS
  4. HKEY_USERS
    ) HKEY_CURRENT_CONFIG
    Re-instal Avast Reconnect to Internet
    You should upgrade your memory.
    OR TAKE THE Computer outside, Petrol works well but to bloody expensive
    Suppose it’s nice to keep these old computers going, A BOSS

And make sure you have no conflicting security software on your system.