I do not see anyone discuss the issue you are having at the link you supplied. Also, ACHI is not necessarily needed for TRIM, though you definitely do want TRIM support. Why do you think this link is the answer?See this for more detail http://www.hardwarecanucks.com/forum/storage/33720-what-achi.html
If you are experiencing slow Windows 7 shutdowns, there is a (fairly) easy way to identify the potential culprit (an antivirus program, driver, or other process).
Navigate to: Control Panel > All Control Panel Items > Performance Information and Tools > Advanced Tools.
In some cases, this screen will actually display the problem under "Performance Issues."
Failing that, open the Event Viewer and navigate to:
Applications and Services Logs>Microsoft>Windows>Diagnostics-Performance>Operational
Highlight Critical and Warning events and look at the description below.
Events in the 100 series are boot events and items in the 200 series are shutdown events.
Here's an example from mine:
This application caused a delay in the system shutdown process:
File Name : tomcat6.exe
Friendly Name : Service Runner
Version : 2.0.3.0
Total Time : 4991ms
Degradation Time : 4491ms
Incident Time (UTC) : 2009-10-28T02:26:41.847025800Z
(Oh noes! this program used up more than 4 seconds extra shutting down! It is part of VMWare so ... necessary evil.)