It seems that you are having slow performance during shutdown and startup. One of the other Events said that your video memory is being over utilized. What are the specifications of your hard drive and graphics card? Perhaps complete computer specs might help as well. Do you keep your Windows OS relatively clean and updated and keep up on general maintenance? When you boot into Windows how many programs start automatically?
You can check and enable/disable startup items with CCleaner, you can also use that to clean out your OS of a lot of junk files and registry of irrelevant keys.
This PC was built back on the 7th of this month (February) and I did a clean install of WIndows 7 Home Premium 64-bit. I run CCleaner all the time and I use the Defrag and Fully Optimize option in Smart Defrag 2 at least once a month.