Go to http://www.openx.f2s.com/html/win32/programs.htm and download some good windows progs.
There's an EXE Lock (meant to be for the Starcraft game) so you can lock your files from others using them, an advanced mailing program and a Desktop enhance program (go there and see).
The EXE Lock program is the best one of the lot, although I recommend that you download the source code and alter the part in lock1.cpp where a list of authorised people is given and add yourself (same with the mail prog). Even if you can't get it to work, just admire the GUI it has. I can't claim credit for these progs as I did NOT make them, so if you have any questions you should email the guy who made them.