Originally posted by: Mark R
If you have multiple 'user names' to log into your PC - and you are running Windows 2000 and Windows XP then there is a powerful file/folder protection system built in.
Unfortunately, this feature is 'hidden' in XP home, but can still can be accessed if you boot into "safe mode".
Here's a quick tutorial
It maybe that this is a bit complicated, or you don't want to use multiple seperate user names on your PC - if that's the case then there are dozens of security programs (some better than others). However, this is a built-in feature and it saves installing another program.