!. Come off line, disable the A/V and firewall and carry out some test function such as typing an E-mail or other document-
Did it speed up?
Many of the protection devices - Mailwasher and Spyware detectors are running scans- thus taking up resources and delaying activity
2. Too many applications active!
Ctrl/Alt/Del and select Task Manager.
Knockout those you are not actually needing in the current session.