I have used this in the past when looking for compatible RAM and had no problem with it, but it seems this crucialscan.exe has been detected by other scanners in the past.

What are the alert details, especially the malware name and when was it detected, on-demand scan or file system shield ?

I downloaded it again from hXXp://www.crucial.com/systemscanner/loader.aspx?Agree=Yes and it downloaded without problem, no alert by the web shield.

I was also able to run the scan and it completed successfully without alert, see images.

So where did you download this crucialscan.exe from and or is it the latest version ?