1. Do a virus scan...remove any viruses, malware, and spyware. Repair system as needed. Make certain virus protection is current and active. 2. Perform hardware checks...repair or replace any malfunctioning h/w (RAM, Drives, etc). 3. Make sure all software is functioning correctly...update software, drivers, as necessary.  
What are your best tips for fixing a slow system? For more questions regarding this contest, please visit the Information Page here.
DS 07/23: What are your best tips for fixing a slow system?