Ok, lemme try to simplify.
1) Click the Start button, type Event in the Start Search box, and press Enter. Event Viewer appears at the top of the results display. Double click it to launch the Event Viewer.
2) In the left pane, drill down through the tree following the path: Applications and Services Logs | Microsoft | Windows | Diagnostics-Performance.
3) Then, in the right pane, double click on Operational. Double click on the column titled "Event Id" to sort it in ascending/descending order.
4) Locate items with event ids 101 to 110. These are related to boot time degradation. Read the description in the box at the bottom, try to find repeat errors. Heres a table for your benefit:
Eventid 101- Slow apps.
102- slow drivers
103- slow services
109- slow device initializing