PC Pitstop Top Spyware and Adware

PC Pitstop has long been a source of information about unwanted software and how it spreads. Now we're using our test results database to give you weekly updates about which programs are the most prolific. The prevalence numbers indicate the percent of PCs tested at PC Pitstop where we detected that file running. Our detection works by file name, so some products may be listed multiple times if they consist of two or more files. To check for spyware, adware, unneeded programs, and many other common PC problems, try PC Pitstop Exterminate or our full system scan. For more information on how this list is calculated, see the bottom of the page.

This WeekLast WeekPrevalenceFile NameDescription
111.988mwsoemon.exeMyWebSearch toolbar
220.277onestep.exeOne Step Search
460.118nnrun.exeAdware-NDotNet [McAfee]
7120.061save.exeWhenU SaveNow
10110.052zangosa.exeZango Search Assistant
11140.052perfs.exeMalware not yet determined
18180.026dssagent.exeBroderbund DSSagent
1950.026rlvknlg.exeRelevant Knowedge

How the survey works

At the beginning of every week we analyze the last 50,000 computers to test at PC Pitstop. This usually represents about a week of computer tests. Our analysis examines all running programs and compares them to our database of known software, using the file name, install directory, and version information to make a positive identification. The scan does not include spyware that consists only of Browser Helper Objects (BHO's) or DLLs that may be attached to legitimate programs or run via RunDLL.exe.

Since the PC Pitstop tests detect unwanted software and recommend its removal, frequent visitors that test their PCs at the PC Pitstop site tend to have less spyware than the normal PC population. Therefore, our results are most likely to understate the prevalence of spyware and adware.