You can only keep one anti-virus... You'll now have to uninstall the other two,, Cancel some startup options & restart..
Run : msconfig.exe (startup tab)
Run: cmd "then" sfc /scannow
What does it give you,,
The best way for uninstalling the Anti-virus would be with the removeltools for them.. Can be found on their site..(Norton's
Your running the minimum spec of memory for the windows,upgrading your RAM would be a good idea.
But for now even with anti-virus managing software more than 1 anti-virus seems to be your prob here.
Keep 1 & if your worried about spam & others.. Download & install malwarebytes anti-malware