stapi64.dll & stpo64.dll are not digitally signed. Need fix

[Bo100]

I ran signature verification and these two Dill,s, stapi64.dll & stpo64.dll came up as "not digitally signed"  i am trying to find reasons why my computer is running slow. Is  "not digitally signed" an issue that should be corrected?

[A_Gayathri]

Hi @Bo100,

Welcome to the HP Support Community

I understand you are facing an issue with your HP Pavilion 500-205t CTO Desktop PC stapi64.dll & stpo64.dll are not digitally signed. Not to worry I will help you to get a resolution to resolve the issue.

Solution 1: Verify Your Game Files in Steam
When you receive the error message “The program can’t start because steam_api64.dll is missing from your computer”, you can use the Steam feature “verify integrity of game files” to restore missing steam_api64.dll file.

Step 1: Click LIBRARY in Steam.

Step 2: Right-click the game which gives the error message in your list of games, and then click Properties.

Step 3: Under LOCAL FILES tab, click VERIFY INTEGRITY OF GAME FILES.
Step 4: Wait for a while. Once the process is complete, click CLOSE.

Then you can launch the game again and check if steam_api64.dll missing error has been solved.

Solution 2: Copy the File from Another Computer
Alternatively, to fix the error that steam_api64.dll was not found or missing, you can copy the file from another computer. Pay attention that the computer needs to meet the following requirements:

Running the same operating system (Windows version) as your computer does.
With the same game installed.
To check the version of Windows on a computer, you can go to Control Panel > System and Security > System. Make sure the two computers are the same in Windows edition and System type.

Then you can copy steam_api64.dll file from the other computer. Here is how to do it.

Step 1: On the other computer, press Win + E to open File Explorer.

Step 2: Navigate to the Steam folder. By default, it is in C:Program FilesSteam.

Step 3: Type steam_api64.dll in the search box to find the file quickly.

Step 4: Copy the steam_api64.dll file and paste it to a USB flash drive.

Step 5: Connect the USB to your computer and then copy and paste the steam_api64.dll file to the same location where you copy the file.

Solution 3: Reinstall the Game
If you don’t want to copy file from another computer, you can try reinstalling your game to fix steam_api64.dll missing error, just as the error shows.

Step 1: In Steam, click LIBRARY.

Step 2: Right-click your game and choose Uninstall.

Step 3: Click Delete to confirm the operation when a window pops up.

Step 4: Click STORE and search the game you deleted just now.

Step 5: Click Play now. Then follow the onscreen instructions to download and install the game.

After the game is installed, you can launch it and check if the error steam_api64.dll missing disappears.

I hope this helps! Keep me posted. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

[Bo100]

Please read the question. " I ran signature verification and these two Dll,s, stapi64.dll & stpo64.dll came up as "not digitally signed". I am trying to find reasons why my computer is running slow. Is "not digitally signed" an issue that should be corrected?

My question had nothing to do with any gaming software.  I ran a signature verification scan on all drivers to see if any drivers were "not digitally signed" and there two, stapi64.dll & stpo64.dll came up as not digitally signed. Two questions. Is it important to have these two drivers "digitally signed" and if it is, then how do download a digitally signed version.