cirrus.sys is simply a process used by your PC to open and execute the files that are required to run software and applications. It is known to all that Windows includes a huge number of files and folders, which are the main programs that comprise Windows operating system. If you are trying to launch a program but it cannot response, that means the associated cirrus.sys process are missing or corrupted from the Applications folder. Occasionally, Windows becomes unresponsive because more and more process like cirrus.sys file are corrupt or are an incorrect version that is not supported by the program or feature trying to access it.
What is cirrus.sys error
A cirrus.sys file should only be located in the Windowssystem32 folder of your pc as this is the default path where this file is designed to execute from. Unfortunately, some of the undetected spyware may be responsible for the cirrus.sys errors occurring on your computer by placing a file with the similar name. Moreover, an uninstall of a program that has been performed incorrectly or incompletely may also lead to the cirrus.sys errors.
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Download it,install it, run it. Perform Quick Scan. Once scan is complete, click Show results-check all threats found and click Remove Threats.
(As a small PS- i choose Superantispyware over MBAM(Malwarebytes), simply because MBAM is not what it used to be, and Superantispyware actually cleans up where MBAM failed)
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Cleaner is a very useful tool that cleans your computer of temp files, history and cookies. Its also used to fix any registry errors.
Doubt if there are any viruses there, but you do need to go back into msconfig – click on startup – untick all except microsoft and your antivirus. I see you have utorrent running, there`s a choice under options in utorrent to open at start up. If utorrents running all the time it will definitely slow you down as others are uploading from your torrents Sanjay, csrss.exe and dwm.exe are Windows processes. I run Windows 7 with 1 GB of ram and it`s far from slow.