I'm not skilled in repairing computers and I'm having a problem. My computer just won't start up. My fisrt problems starter three months ago,when the computer began to freeze while working with google chrome. After that, the windows 7 has been re-installed at least twice, but it did little help and freezes randomly. However today, it froze while I was watching a movie and after attemted restart just started start up repair. Afterwards, it said that it was successful even though it also said that it could not find the cause of the problem. I'm a bit desperate and googling does not help much. I would be really grateful for any help. I 'm sorry if my English is not great, I'm not a native speaker. Thank you.