I dual boot, so I use portable apps to keep the same setting across OS.
On my laptop I have Chrome Portable installed on the shared drive.
D:\Programs\Google Chrome
Every couple of days I find a Google Chrome folder in my start menu. Inside that folder is a link to a different copy of Chrome located at
C:\Users\Thomas\AppData\Local\Google\Chrome\Application\chrome.exe
Also an uninstall shortcut.
I'll delete the folder and few days later it's back.
It only seems to happen in my primary OS which is Vista SP2
Thanks