Base System Device Error on my Device Manager

Hi,
I have an Acer laptop with Windows 7 x 64 running on it. But originally, I purchased this laptop with pre installed operating system Windows Vista Home Premium. I asked a computer tech to change it to Windows 7.
It's been 6 months and there has never been any problem with my computer. But recently after a series of errors which I don't know the root cause of it, I was forced to reformat my system with the recovery disk given by the same computer tech. So far, I have reformatted my computer 4 times now. I don't think I ever succeeded with any of those processes. It always ends up with errors, freezes and hangs. Through all those formatting process, I always checked on my device manager to see if I there are still hardware’s that needed a driver.
I recognize three Base System Device under Other Devices with yellow mark on the side which means that it is not properly installed. I checked on Acer Support and downloaded all the necessary drivers and all are properly installed now. But the yellow marks are still there.
I never notice this the first time I changed my operating System to Windows 7. I just want to know if this error is important to my system and what necessary drivers do I need for this? I need advice, kindly help me. I’m not sure but maybe this is the root cause of my dilemma.
Thanks in advance.
