Re: "My computer"and"My documents" opens up automatically at the time of windows startup
Sound like they got put in the Startup folder. Check Start, Programs, Startup to see if they are there. If they are, then just drag them to somewhere besides the Startup folder. If they're not there, then some command is launching them at startup. Do you have *Anti-Nasty software installed and updated?
*Anti-Nasty software = Anti-Virus, Anti-Malware, etc.