What causes windows to stop booting correctly?

Im REALLY angry right now its only been a week since i installed windows 7 and now its not booting properly anymore! What makes me mad is that the only thing i downloaded ever since is google chrome and i havent been to any bad sites at all only youtube, google, facebook... And now its back to not booting whts... show more Im REALLY angry right now its only been a week since i installed windows 7 and now its not booting properly anymore! What makes me mad is that the only thing i downloaded ever since is google chrome and i havent been to any bad sites at all only youtube, google, facebook... And now its back to not booting whts causing this!? I have an antivirus installed and antimalware program installed already. Whats my problem??

Comp specs:
Acer aspire v3-551
Toshiba 700 GB hard drive
4 GB DDR3 memory
A-8 4500m amd processor 1.9 ghz - 2.9 turbo
Windows 7 home premium 64-bit
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