laptop really slow! google chrome keeps crashing?

[♥♥Cat Lady♥♥]

My toshiba laptop is really slow! Google chrome kept crashing. I stopped several programmes from running at startup like windows troubleshooter suggested. Still no good. So I uninstalled chrome and went back to internet Explorer and its even worse? I no longer have the installation cd to do a factory reset. Avg detects no virus? And I did the avg fix pc issues and it says your pc is now running faster... nope?? It does say internet Explorer is using a lot of memory?? Can anyone help? If so please explain it as you would to a small simple child!!! :/