Winlogin.exe Error on Windows 8 Evaluation Copy

I am currently running Windows 8 Evaluation copy on my HP PC. I am using an internet through a wireless router and everything is running smoothly until yesterday when the router suddenly stopped getting a connection to the internet. I checked all the cables and get a Winlogin.exe error: Cannot find drive F:. Under the nutshell, I can connect directly to the internet but I am unable to connect through the router. I used my other laptop to check if the router is working and it can connect. How can I fix this?
