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dll What is rtlcpapi64.dll?
RTLCPAPI64.DLL is developed by the Realtek Semiconductor Corp. It is a process from RtlCPAPI Module and it can be found in the location of c: \ \windows\ \system32 \driverstore \filerepository \hdxseds.inf_amd64_neutral_c5a916a8df047f7d \ \rtlcpapi64.dll. Its size is 323.6 KB.
rtlcpapi64.dll common file locations:
%windir%\SYSTEM32\RTLCPAPI64.DLL
rtlcpapi64.dll error messages
Some commonly known rtlcpapi64.dll error messages that can show up on your computer are :
The file rtlcpapi64.dll is missing.
rtlcpapi64.dll Not Found.
This application has failed to start because rtlcpapi64.dll was not found. Re-installing the application may fix this problem.
File rtlcpapi64.dll not found.
rtlcpapi64.dll not found. Reinstalling might help to fix this.
How to fix a dll error manually?
Note: Do not fix a dll error manually if you are not a computer professional & don’t know what a dll error is and how a dll error occurs. If you do so, there are high changes that you may damage some parts of the registry and some applications would fail to load.

It is important to register the dll so as to avoid any dll errors. To do so, follow the steps listed below:
1. Click on Start.
2. Type “cmd”, right-click on the command prompt option and choose “Run As Admin”.
3. Hit enter.
4. Now type “regsvr32.exe “C:\Windows\System32\rtlcpapi64.dll.
5. Hit enter.
6.Your dll will be registered.

How to fix rtlcpapi64.dll Errors with Dll fixer (PC Speedup Pro) ?
Note: Avoid downloading the rtlcpapi64.dll file individually from any DLL downloader site. If you’ve already downloaded it from these sites, remove rtlcpapi64.dll from your computer and follow the steps listed below to avoid your system from behaving abnormal :

1.Restart your PC if you haven’t done that already.
This will clear up the remnants of deleted rtlcpapi64.dll file. In case of any remnants, it is possible that the applications using components of that dll may cause the apps to misbehave. To avoid this, it is necessary that you restart your PC just after deleting the rtlcpapi64.dll file.

2.Install Dll Fixer’s tool PC Speedup Pro from here. Upgrading the tool to its latest version will fix the rtlcpapi64.dll error.
PC Speedup Pro registers the missing dll in your PCs registry so that the dll error does not occur again.

3.Run the tool and it will fix the rtlcpapi64.dll error.
This tool not only repairs a particular dll error but also repairs other missing/corrupt dll files.

4.Click on "Start Repair" button once the scan is over.

This will fix your rtlcpapi64.dll error.

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