Unless something is installed there, then that PCI caution symbol is not a threat to you.
Go into device manager > file > scan for new hardware. If nothing new shows up then you should be able to disable that PCI slot and it won't be an issue.
For the blue screen, follow the tutorial in the link below. It's for Windows 8 but it should work for you.
http://www.tomshardware.com/faq/id-1653275/fix-...
Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.