who use my computer

Try STARR from www.iopus.com. It logs keystrokes and window titles, and can run undetected.

If you know what you want your brother to do and not to do, set up a Group Policy Object and configure it to you or your brother's needs. You'd be surprised with the things you can limit a user to do.

Another thing that is handy and easy is accounts. Give him an account, with out Admin privileges.
When he logs on he will get a whole set of user profile folders under Documents and Settings.
It is easy then to track what he does, vice what you are doing, just by looking through his history, temp internet files, and cookies are an easy way to track him across the net.
Since he does not have Admin rights, he should be very limited as to what he can load program wise.

Set up auditing.

Go to Administrative tools...
Go to Local Security Settings...
Go to Local Policies...
Go to Audit Policy...
Edit the auditing of events as you see fit. Then just review the Event Manager under Administrative tools.

I noticed that you rejected answers containing the use of audits and less powerful accounts, so I assume that you don't want him to know that you are checking up on him. Sounds like you want a key board capture type of software such as Key Thief. Run a search on key loggers on the net and I'm sure you will get a buch of hits. Find one that will suit your needs and install. It will tell you exactly what he is doing and what programs are open (if you get one of the better ones).

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