Portd2k.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if portd2k.sys is a Windows system file or if it belongs to an application that you can trust.
The process known as BounceBack Port I/O or ABS Port I/O or CMS Port I/O belongs to software CMS PortIO Service or ABS PortIO Service or Windows (version 2000 DDK driver) or BounceBack by CMS Peripherals (www.cmsperipherals.com) or Windows (windows.microsoft.com) (version 2000 DDK provider).
Description: Portd2k.sys is not essential for the Windows OS and causes relatively few problems. Portd2k.sys is located in the C:\Windows\System32\drivers folder.
Known file sizes on Windows 10/8/7/XP are 14,976 bytes (50% of all occurrences), 7,296 bytes, 7,424 bytes or 7,212 bytes.
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. Portd2k.sys is not a Windows system file. portd2k.sys appears to be a compressed file. Therefore the technical security rating is 40% dangerous.
Recommended: Identify portd2k.sys related errors
Important: Some malware disguises itself as portd2k.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the portd2k.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.
A clean and tidy computer is the key requirement for avoiding problems with portd2k. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To help you analyze the portd2k.sys process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.