Many performance problems can be solved by uninstalling MucAfee and installing free MS Security Essentials to run with the Win7 Firewall.
Microsoft Security Essentials
As to your slow startup, uncheck all but AV and gadgets in msconfig>Startup to see how things speed up. After a few restarts check if any programs have written themselves back into the Startup list, then find out how to deselect them at Startup in their Preferences.
Startup Programs - Change
Next in msconfig>Services Hide all MS Services to see what may be running without your knowing. Turn those programs off in their Preferences or uninstall.
Many of these tips for cleaning factory bloatware preinstalled on laptops may help speed things up and familiarize you better with your options:
Clean up factory bloatware