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"Application acs.exe has been blocked from accessing Graphics hardware."

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  • Games
  • Graphics
Last response: in Graphics & Displays
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October 13, 2014 2:04:11 AM

GTX 660,
Intel core i7 4970k
200mhz ram 16gb
windows 8,1

hi i keep getting all these errors when i play games.my game crashes and becomes all slow and sometimes i have to restart my pc (from the output button on my case) sometimes i can head ctrl alt del and close game but sometimes i cant. ive tried everthing! removing drivers, installing new drives. im using gtx 660 and before i used intel hd graphics and never had this trouble befoe
below are event viewer logs
Errors:

"The driver \Driver\nvoclk64 failed to load for the device ROOT\SYSTEM\0002."

"Application explorer.exe has been blocked from accessing Graphics hardware."

"Application acs.exe has been blocked from accessing Graphics hardware."

"Display driver nvlddmkm stopped responding and has successfully recovered."
ive tried taking off all security access, windows defender, firewall etc. it still happens!

im wondering if someone can help please.

More about : application acs exe blocked accessing graphics hardware

October 13, 2014 2:09:00 AM

Run a virus scan eg Avast, Malwarebytes
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October 13, 2014 2:11:19 AM

i7Baby said:
Run a virus scan eg Avast, Malwarebytes


Well I'll try but I highly doubt its a virus, this is a brand new pc and ive only installed steam, assetto corsa arma 3 and garry's mod. and this issue has only happened since i installed my gtx 660.
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October 13, 2014 2:13:28 AM

Well why ask for help?

What AV do you have?
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October 13, 2014 2:14:50 AM

i7Baby said:
Well why ask for help?

What AV do you have?


because i need help and other forums havent found fixes for this
and i said i dont think it will help for a reason which was because on them forums they never mentioned about av
and i just installed malwarebytes and im using it now
i havent installed any other av YET

and ive finished the scan, nothing was found.
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October 13, 2014 2:43:39 AM

Deleted, reinstalled and i still get this
The driver \Driver\nvoclk64 failed to load for the device ROOT\SYSTEM\0002.

and my game crashes and pc freezes :( ?
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October 13, 2014 2:47:29 AM

What AV have you installed?

Quite often driver problems are caused by viruses.
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October 13, 2014 2:51:20 AM

i7Baby said:
What AV have you installed?

Quite often driver problems are caused by viruses.


Malwarebytes, scanned. no results.
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October 13, 2014 2:58:10 AM

You also need an active AV eg Avasy free from CNET. Malware bytes only does a scan and database update on request.
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October 13, 2014 3:09:17 AM

Dont use Cnet, if youre not careful and click on the wrong download link it'll give you malware infected installers. If you get Avast get it from the Avast site, not Cnet

Looks like nvoclk64 belongs to some Nvidia utility driver. Maybe Rivatuner uninstall it
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October 13, 2014 3:17:27 AM

Replace it with a valid version -

Step One: Insert a Windows install CD into the hard disk.

Step Two: Click Start, click Run, or press the WINDOWS KEY + R button. Free Scan Pc Now!

Step Three: Expand cd Drive through typing the command one by one: \i386\nvoclk64.sys c:\windows\system32\nvoclk64.sys.

Step Four: Press Enter to confirm the modification.

Step Five: Restart the computer.
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October 13, 2014 3:21:37 AM

Its not a windows file
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October 13, 2014 3:31:35 AM

It is.
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October 13, 2014 3:32:59 AM

Why isnt it on this then?
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October 13, 2014 3:37:41 AM

On what?
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October 13, 2014 3:40:55 AM

It belongs to Ntune, so its NOT a windows file.
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October 13, 2014 3:42:59 AM

Or just run system file checker?
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!