The symsrv.dll file is a legitimate component used for software debugging. However, it is frequently mimicked or infected by malware like the Floxif trojan, which can inject code into running processes and block security sites.
If you still see "Error loading symsrv.dll" after all the above, the malware has likely corrupted a legitimate system dependency. Try these final steps: symsrvdll virus removal tool link
sfc /scannow: