[Nyx]

If you really want to start from scratch and make sure you're secure, take your hard drive, cook it in your oven, smash it with a bat and then drop it in a lake, then buy a new hard drive and reinstall your OS. Professionals can recover your data even if you try to wipe it.

Well it is better removing the evicence before it is too late

You say you removed the evidence, but how did you 'remove it'? If you tell me that you put it in your Windows Recycling Bin and then emptied your recycling bin and think that all the data that you put in there is gone you're an idiot.