Macbook Air Won't Start Correctly

WHello.
I have the previous version of the Macbook Air. When i turn it on, everything seems to be normal. I input my username and password and login.
But then, the icons on my desktop won,t show up. The dock and the top tab is in place. The computer is working -somewhat slowly- but my icons on the desktop won't show up and my keyboard shortcuts don't work. For example, i had command+d set as show desktop, but this command won't work. Neither does the right click with two finger tap on the trackpad.
What could be the problem ? Any suggestions ?
Thanks in advance.

Restart.
http://support.apple.com/kb/ts2570
Start up in Safe Mode.
http://support.apple.com/kb/PH14204?viewlocale=en_US
Repair Disk
Steps 2 through 8
http://support.apple.com/kb/PH5836
Reset PRAM.  http://support.apple.com/kb/PH4405
Reinstall OS X
http://support.apple.com/kb/PH10763?viewlocale=en_US

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    com.apple.iokit.IONDRVSupport 2.4.1
    com.apple.iokit.IOAcceleratorFamily2 156.14
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    Try SMC and NVRAM reset:
    https://support.apple.com/en-us/HT201295
    https://support.apple.com/en-us/HT204063
    Then try a safe boot:
    https://support.apple.com/en-us/HT201262
    Any change?
    Still get rid of AVAST.
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