Most antivirus programs identify css.exe as malware—for instance Kaspersky identifies it as Trojan-Downloader.Win32.Small.addb, and TrendMicro identifies it as TROJ_DLOADE.DAP.
The css.exe file is a software component of HP Backup and Recovery by Hewlett Packard.
The HP Backup and Recovery Manager is an easy-to-use application that allows a user to back up and recover the primary hard drive on the PC. The application works within Windows to create backups of Windows, applications and data files. Backups can either be scheduled to occur automatically at designated intervals or they can be initiated manually. Critical files can be archived separately from regular backups. Recovery Points and file backups can be copied to CD or DVD discs providing the appropriate hardware is installed. All backups can be copied to network or secondary hard disks.
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The process belongs to software HP Backup and Recovery by unknown.
Description: Css.exe is not essential for Windows and will often cause problems. The file css.exe is located in a subfolder of the user's profile folder.
Known file sizes on Windows 10/8/7/XP are 103,424 bytes (66% of all occurrences) or 479,232 bytes.
The file is a file with no information about its developer. The program has no visible window. The file is not a Windows system file. The process starts upon Windows startup (see Registry key: MACHINE\Run). Css.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 68% dangerous, however you should also read the user reviews.
Recommended: Identify css.exe related errors
If css.exe is located in a subfolder of "C:\Program Files", the security rating is 70% dangerous. The file size is 479,232 bytes (33% of all occurrences), 103,424 bytes or 581,120 bytes. There is no information about the author of the file. The program has no visible window. The software is loaded during the Windows boot process (see Registry key: MACHINE\Run). The file is not a Windows system file. Css.exe is able to record keyboard and mouse inputs.
Important: You should check the css.exe 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.
The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active css process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the css.exe on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.
A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.