What you could do for now is to delete any unneeded software.
Then download and install Ccleaner and delete any crap on the PC.

Then i would uninstall AVG, its a really bad idea to run 2 AVs at the same time, also ITS COMPLETELY OUTDATED.
Please use one of this tools here to uninstall AVG: http://www.avg.com/de-de/utilities
ALSO UPDATE AVAST, HE IS RUNNING VERSION (newrest is 2014.9.9.2011 http://forum.avast.com/index.php?topic=142936.0)

Then go to start>run and type in msconfig.
In the Window select the services tab and click hide all Microsoft services at the bottom and then disable everything except from the Antivirus.

Then go to start>All Programs>Accessories>System programs>Disk defragmenter and run this, should be run every few weeks.
Also go to the system start tab and do this there as well.

This could help a bit for now.