because of i'm working in day time. my computer at home have been use by another person (siblings) how can i track all activities that HAPPEN to computer, i mean:

1- what kind of website they all surf?i need log file about this that can not be erase

2- for how long?

3- are they download something?can i PREVENT it?

4- are they installed something?can i prevent it?

5- what kind of program they use? i mean like microsoft office

and any other activities, i would like to monitored my computer...
currently i'm always RECEIVED ERROR messages, pop-up, virus alert etc

do i need to download some software..

there are lots of programmes out there try NETNANNY


BARTROBLOL, there are so many differnt types of programs you could use for this, i would personally use google (http://www.google.com) to search for one. Or you could use a keylogger of some sort peace out hope u find a good one at a reasonable price ;~)

P.S: i reccomend you read this it has some useful information: http://www.boutell.com/newfaq/browser/protectkids.htmlactually i don't have kids.
what i am worried about is sick adult in my house.
i would like to prevent installed any software in to my computer.
i would like to have a proof that sick person have surf or play stupid thing.
can i do that?some like log file
To accomplish this your best bet would be to password protect the main machine and set him up on a limited user account...this way they will not be ABLE to install/uninstall anything....