Here's a description of what's going on. This server is currently running AD, DNS, DHCP and a file server. When I go to the event viewer, a query error displays stating "Microsoft-Windows-DCLocator/Debug | The system cannot find the file specified. One of the errors stats "Microsoft-Windows-Security-SPP Error Code:0x80070005". Another error seems to be linked to reverse DNS. I managed to fix this error once before and am not sure if it's caused by all of the other errors because the reverse dns entries are still appearing. The error code for that one is 0x801c001d.
Also, when I open the start menu there are no icons displayed. Just blank boxes where the icons used to appear. Some domain computers are also having issues opening excel files. They have to open Excel first, then open the file for it to work.
Any help is appreciated!