Thanks, also I get something that says the file access is denied because of password protection in the scan results and it won't let me take any action.
Many programs (usually security based ones) password protect their files for legitimate reasons such as AdAware and Spybot Search & Destroy, there are others (and avast doesn't know the password or have any way of using it even if it did know it).
When you run scans with the above programs and you delete harmful entries that they detect, a copy is kept (in quarantine/restore/backup) in case you need to reverse what you did. These are usually password protected, you should do some housekeeping and delete old backup/recovery/quarantine entries (older than two weeks or so), this will reduce the numbers of files that can't be scanned.
By examining 1) the reason given by avast! for not being able to scan the files, 2) the location of the files, you can get an idea of what program they relate to. You may need to expand the column headings to see all the text.
Files that can't be scanned are just that, not an indication they are suspicious/infected, just unable to be scanned.
Also about the installation of a keylogger, if for checking on what kids view or do etc. then what you want is a pro-active monitor not something you find out what and where they have been after the fact. There are a number of parental control tools out there. - Naomi Parental Control software (freeware)
http://www.radiance.m6.net/, which is freeware I believe.