Hi Stephen
Open Task Manager (Ctrl + Shift + Esc)
Choose the Processes Tab
Leave that window open to monitor your system
When your system is slow/lagging, is your Hard drive, CPU or RAM overly busy at that time?
If so, click on the appropriate column header, so the arrow faces down
What are the top 5 processes at that time?
The problem is that I can't even open the task manager, its that slow.