Cooinda
What you do depends on how much you REALLY want to cover your tracks ! The methods quoted above will hide your actions from a casual observer but the information will still be on your hard drive & can easily found using , for example, a prog called "EnCase" ( which is available free to download ). To be really secure , you have to shred the relevant files, wipe all free space & clean the Windows swop file. As well as "Evidence Eliminator" , I believe progs such as BCWipe" & "Directory Snoop" do much the same thing.