Ran across another nasty spyware today, and again, Castle Cops was able to help me figure out how to get it out. IST Bar seems to be a rather nasty little bugger and most spyware can’t help you get it out. However, there is a tool you can use, Process Explorer from sysinternals.com that will help you get rid of it. Instructions from the thread have been copied below:

1. Download a freeware Process Explorer for Windows from www.sysinternals.com, install and run it
2. Find the mother of ISTsvc.exe, for my case, it was c:\Windows\yagoumc.exe
3. Fire up TaskManager, stop the mother process
4. Delete the mother .exe
5. Again, stop the ISTsvc.exe
6. Delete the ISTsvc.exe
7. Run Ad-Aware to clean up Registry entries