Recently, Microsoft Security Essentials (MSSE) installed on my PC detected a "Password Stealer". I opted to delete the "password stealer". Then I tried to open my Chrome browser and BOOM, it crashed saying the file doesn't exist. I figured out that the "password stealer" deleted by MSSE was in fact Google Chrome.
I reinstalled Chrome, but that won't run saying a permission error. Here is what I did to solve that:
1. Go to: C:\Documents and Settings\\Local Settings\Application Data\Google\Chrome\Application
2. Run chrome_new.exe
That's it, now run Chrome.exe, and you should be able to use Google Chrome again.