Overview of Acpi.sys What Is Acpi.sys? Acpi.sys is a type of SYS file associated with MSDN 2939 developed by Microsoft for the Windows Operating System. The latest known version of Acpi.sys is 1.0.0.0, which was produced for Windows. This SYS file carries a popularity rating of 2 stars and a security rating of 'UNKNOWN'.

What Are SYS Files? SYS files such as acpi.sys are third-party (eg. Microsoft) device drivers or critical system files that come as part of the Windows operating system.

Most SYS files allow internal PC hardware or attached hardware, such as a printer, to communicate with third-party software programs (eg. Web browsers, word processors, MSDN 2939) and the operating system (eg. Other SYS files are critical system files called 'kernel mode device drivers' which are used to power the Windows operating system. Files such as 'CONFIG.SYS' contain configuration settings and specify what device drivers should be loaded by the operating system. Without driver files such as acpi.sys, you wouldn't be able to do simple tasks such as printing a document. Why Do I Have SYS Errors? SYS file errors are typically caused by faulty hardware or corrupt device driver files.

Question Q: Trying to install Windows XP I get the message that 'acpi.sys is open or in use by another process' and it won't install. Find It Game S For Macbook Pro. Game Links Fifa 13 Pc For Android on this page. Halo Combat Evolved Full Version For Windows 7 on this page. Windows Vista RTM Installation error ACPI.SYS. With win XP installer you can turn ACPI off and force the setup to proceed, is there a trick with Vista setup too?

Because of the importance of Acpi.sys in the functionality of MSDN 2939 and other Windows functions, any corruption or damage to this file can create critical system errors in the form of a 'blue screen of death' (BSOD). Please see 'Causes of Acpi.sys Errors' below for more information.