Your log locked clean to me I didn't notice any infections but you have too many programs running.
Norton, AVG, a couple of dell startup items, adobe, yahoo toolbar, etc.
Norton by itself is a resource hog and your running avg alongside it it appears from your log.
Uninstall either norton or avg completely from your system by going into start-control panel- add and remove programs, also remove any other useless programs you have installed.
go into start-run-msconfig select startup tab and untick everything but your anti virus program.
reboot
install ccleaner
CCleaner - Home
close any open programs, run cleaner, then select issues, fix issues.
defrag and you should be good.