Google Chrome does not launch after some months without using it in Windows XP/Seven

Well, I have in computers I use with Windows XP or Seven more than one browser installed on them, generally Internet Explorer 8, Firefox 4, Opera 11 and Google Chrome.

I often use Firefox, but I want to use Google Chrome sometimes because I have a lot of addons and webapps on it.

The issue is: when I try to execute Chrome after some months without using it, it does not function. Using Proccess Explorer or Task Manager, I can see that there is not any Google proccesses running. Then I reinstall it and all functions. But if I do not use it for some months again, it will not function...

Is it an update problem? Must I use Chrome everyday or is there another way to avoid that issue?

PS: I installed English and Portuguese last versions (how to get the version numbers when it does not execute?), not at the same time, and it continues to do not launch...

PS2: There is a running Google Update proccess that is launched in startup:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
   Name:            Google Update
   Type:            REG_SZ
   Data:            "C:\Users\Ubirajara\AppData\Local\Google\Update\GoogleUpdate.exe" /c

Answer

If you have not deselected the options to back up your data -- on by default when you sign into Chrome with your Google account -- you can (uninstall and) reinstall Chrome. Your synced settings will be restored when you log in to the fresh Chrome.