I'm not sure what you mean by removing the extensive list of yellow flagged items, but...
If you see a yellow flag against a device in device manager, it means that it is attached to the pc as a device but not working properly for one reason or another. So, what you need to do is get them working one by one.
Not all devices are critical, but most of them will be needed to make the thing work correctly.
What you need to do is click on each yellow flaggged device & read the status message displayed in the pop up box. Most of them will probably tell you that the device driver is not installed. There will be a driver tab on that device. Use this to update the driver. If you're connected to the internet, then choose the option to update the driver by connecting to the internet. Windows will search for a driver automatically. If it doesn't find a driver, make a note of the device & navigate to the Toshiba website and try to download the relevant driver from there. Toshiba should provide drivers as required.
I wonder why you have a machine that shows multiple not working devices? Have you changed any hardware recently or checked for viruses lately? It is unusual that a machine should suddenly have mutliple hardware issues.