ACS.exe is a driver process of Atheros wireless card. Normally it should be located in the Windows’ System folder, if you find acs.exe and rxBot.exe in C: \ Program Files \ ACS-Style, that means your PC has been infected with the Kelvir.I worm, in which rxBot.exe is a copy of Win32.Rbot.CGR virus, acs.exe is part of the worm propagation. The virus will attempt to send messages to all online contacts in the address book, including a URL connection, if the user clicks on this link, the virus will be downloaded to the machine.
Besides, acs.exe is also a normal process of outpost firewall instead of a Trojan horse virus. As follows:
File name: ACS.EXE
Description: Agnitum Outpost Service
Location: C: \ PROGRAM FILES \ AGNITUM \ OUTPOST FIREWALL PRO
Besides, ACE.EXE is also an assistant editing tools.

Problem Description:
Most of the reasons why missing exe file problems prompted is because the file is damaged by trojan viruswhich leads to system can not find the file, thus an error message box pop up, or the program can not run. Simply we can just use a powerful third-party software to help you detect and fix the exist or potential ACS.exe problem once and for all, or go to a professional exe file download sites, after downloading the file, find the file version for the program, copy to the appropriate directory, problem solved.
1, Windows 95/98 / Me system, copy to the C: \ WINdows \ system32 \ directory.
2, Windows NT / 2000 system, copy to the C: \ WINNT \ system32 \ directory.
3, Windows XP system, copy to the C: \ WINdows \ system32 \ directory.
4, Windows 7/8 system, copy to the C: \ WINdows \ system32 \ directory.

ACS.EXE occupy too many resources problem solving:
Under the circumstances outpost has been installed in the computer, ACS.EXE is the normal process of outpost firewall, when performing some program such as P2P download, due to the need to monitor numbers of connections, ACS.EXE will seriously drain CPU resources, resulting in sluggish computer system caused by busy, we can regulate outpost firewall settings, ignoring P2P software related processes, ACS.EXE occupy too much CPU resource problem can be solved .