According to click here
FSW (FSW.exe) Causes lots of pop-up windows to appear.
Go to Start > RUN > Type: MSCONFIG > Click "OK"
Startup Tab > Find FSW and remove the tick in the box next to FSW > Click "ok" > Now restart your computer. That will stop the message appearing.
Run your Virus scanner and see what it picks up is anything.
No virus Scanner? click here for a free Virus scanner or click here for a free online check.
click here and download Ad-aware 6.
click here and download Spybot - Search & Destroy 1.1...
They are free and its best to update them once you have installed them.
These will no doubt remove FSW from your computer and any other nastys.
I'll shut up now.