Welcome to the forum Sandy,
How did you remove McAfee ???
The proper procedure for removing another Av product and installing avast! follow:
Instructions to successfully install avast! 6:
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Download the product avast!6 Free:
http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html?part=dl-85737&subj=dl&tag=button
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Download the REMOVAL TOOL for your current Anti Virus Program by following the Guide offered here:
How do I remove old third-party antivirus software before installing avast!?
https://support.avast.com/index.php?languageid=1&group=eng&_m=knowledgebase&_a=viewarticle&kbarticleid=574
( The removal tool for avast! Antivirus (should you ever need it) : http://files.avast.com/files/eng/aswclear6.exe)
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Once these 2 programs are saved to your computer in a folder that you can locate or,
to the desktop and you can easily identify these 2 files, DISCONNECT FROM THE INTERNET
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Go to the Control Panel > Select add/remove > (Programs and Features in Windows 7)
select your current antivirus program and select uninstall. (Allow it to uninstall all features of the program)
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Reboot your system.
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Run the removal tool for your old Anti Virus Program saved in step #2
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When the tool finishes running, again Reboot your system.
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Install avast!6 Free by running the program downloaded in step #1
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Shut down your system – Reconnect to the internet – Start your computer.
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Avast!6 Free will now be installed and will update it’s virus database.
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Register your new avast!6 Free product by selecting the Register Now button.
If you need more help, get it from here: http://www.avast.com/registration-free-antivirus.php
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Once this is done, you’ll be ready to enjoy the new product as much as I already have for many years.
Hope this helps you solve your problem. (Provided the problem is related to an improper removal and installation.)