No start menu when I start my computer

I have been using my computer normally for the past few weeks and I run Iobit Advanced Windows Care along with A-squared free anti-virus. My computer has been running pretty smooth until the other day I ran A-squared and It was finding some type of trojans that were high risk so I quarantined the items it suggested but now when I restart my computer I have no windows start menu and I can't access anything on my computer. Apparently I need some better virus protection software!! I have had this happen before and I had to reinstall windows completely which I am trying to avoid doing this time if possible. If anyone can help please let me know thanks!

Turn on your computer, in Normal mode
Right-click on the bottom of the screen and Open Task Manager
Click on the applications tab and end the process
Open task Manager again and click on the New Task button
Type in - explorer.exe - and click OK
If that brings up the Desktop, then we can run some scans
If that doesn't work, see if you can get into safemode w/networking