Helping people with computers... one answer at a time.
There are many files with the name updater.exe, but so far most of them appear to be adware or spyware.
What is updater.exe?
Apparently there are several different files all named updater.exe. And so far most of them appear to be adware/spyware. This page has a fairly comprehensive list.
The bottom line is that you need to get and run a good anti-spyware program asap.