Once I found the txt file with all user names and passwords

on my computer but I forgot the name - what a stupidness. This is just text file heh. But I will find it again. OK enough about passwords and such crap. The truth is that noting in the net or on your computer is not sicret but who cares.

Probably you have seen in the movies bad guys with masks just entering the bulding and the smartass olready have seen them on the cameras so he is rebooting his computer and hit the road. After that is nothing left on his hard drive. This is just one open source program named eraser. It can be just installed and it can erase without a trace everything what you dont want to be seen ever again. After instalation you will have right button option erase

you still dont have to be sure that specialists can not recover the nessesary information but you have much bigger chanse.