Traces.

[niki]

Some one from my office accessed by data illegally and now I want to figure out who was that person. Is there any way to find out what all did he viewed.

[attagirl]

Well if it were on an office computer, that belongs to the company and the company gave authorization, they have the right to do this. Just because you store or access personal information at work that does not mean they are violating your rights or accessing your data illegally.

We would need a little more information to ensure you get the correct answer.

[funtoosh]

There are applications for that which have to be preinstalled and now once your PC is restarted its almost impossible to get back any information. Still read following article for more details.
www.microsoft.com/resources/documentation/ windows/xp/all/proddocs/en-us/nt_smlogcfg_tracegenl.mspx

[blasted]

If you download something called a netsupport program on your computer you can view exactly what computers are on and the history of them.Or install keyboard loggers on all the computers.If you had nothing like this on before this happened there is nothing you can do.