Hal.dll error :-
Hal.dll error occurs in the windows system due to missing or corrupt hal.dll file. This file is located in the location C:/Windows/System32/hal.dll.  Since it is a dll file so it is more responsible to perform the system tasks. When you run the programs of windows os then much of the functionalities and modules are distributed by dll files. Dll files helps to code reuse, reduced disk space, promote for modularization of the code etc and the system performance gets fast and programs load and run faster with few disk space. It is based on shared library concept which allow developers of shared code to modify or upgrade the functionality without requiring applications to be re-compiled. Hal.dll also perform such activities. If this file gets damage or corrupt due to malware or system files missing then it doesn’t support system to run the programs. The error message is-

"Windows could not start because the following file is missing or corrupt:

<Windows root>\system32\hal.dll.

Please re-install a copy of the above file."

"<Winnt_root>\System32\Hal.dll missing or corrupt:

Please re-install a copy of the above file."

"Cannot find \Windows\System32\hal.dll"

"Cannot find hal.dll"

Cause of hal.dll error:-

Corrupt or damage hal.dll file is the main cause of hal.dll error. It is very simple to know the reason of this error because the file which occurs this error is included with the error message. If you are changing the system setting and during this process you have changed the location of the hal.dll file then when you run the program it will not match to the desired location and produce the hal.dll missing error. If this file is deleted accidently by user or malicious programs entered in the system and deleted or corrupt then it may be the cause of hal.dll error. 

Solution of this problem:-

It is compulsory for you to fix hal.dll error if it occurs in your system during working on the system because it indicate that your system is missing and the dll file name hal.dll is damaged or corrupt so it is unable to support and run the programs. Scan the system to make sure that your system is protected from malicious programs such as virus, Trojan, malware, adware etc. If any issue related to such type of programs found then remove them and restore the system because if the hal.dll file has moved from the location which is default location then it can be recovered. You can also replace the hal.dll file to fix this error. The given steps are very useful and you can use to fix had.dll error. I have also used these steps to fix my pc problem.  

http://www.fixwindowserror.com/easy-fix-missing-corrupted-hal-dll-error-booting-problem