I have like that before, but probably hacker wouldn't just boot normally if they want to get something WITHOUT noticing.
Best ways to make your hacker HARDER to break in:
1. Put bios passwords - setup and bootup. Setup in bios that you boot directly to IDE only and disable: floppy, cdroom, and usb.
2. Put windows login password, when it asked you, make it PRIVATE your folder files. This will ask you ONCE, if you're not sure, go back to User Account in Control Panel, remove your password and put it again. Remember that your Windows login password is very important!
3. Hopefully, your boot drive is NTFS file. They can't see NTFS drive if they are just using like fat,fat32 drives.
4. When you go out for a while, just press WIN+L (two keys only!). This is better than having a screensaver with password.
5. If possible have your pc base with a kind of padlock. See link how they break by brute force.
6. Right-click My Computer -> properties. In REMOTE tab, uncheck 'Allow users to connect remotely to this computer'. As I said your Windows login password is important. If they know your password they can get in if this is enable.
7. Don't allow anybody to put a file (even a single executable file) to your computer, as that might be a spy/keylogger. So (4) is very important! If you're not sure, then install a firewall like ZoneAlarm. With ZoneAlarm, you will see which programs are going out and going in. So, just allow which seems not spy programs.
8. If you want REALLY to secure your PRIVATE/CONFIDENTIAL files, then use CRYPTAINER LE. This is one beautiful piece to secure your important files. It will create a virtual drive, then just drag there all your files. Once close, the drive will disappear and it can't be undeleted (by active@undelete). But be sure not to forget the password!
Another one is folder lock but I think cryptainer is much better and the one I'm using (folderlock has conflict with active@undelete). Cryptainer LE is free for up to 25Mb to encrypt. I think this is fair enough but if not then consider using at least 2Gb USB Flash or even a 2.5" hard disk which has no external power (it's just using USB power) and fit to a pocket. Put all your files there and may even serve as your backup!