I read a little about this program at Wilders security forum.
It's free .Apparently there are two versions of the program.
I have been playing around with it for a few days.It does work well with Opera and IE6.
It is a lot like a beta from what I have seen of it on my computer.Some programs do not work well when launched by Sandboxie.I am reporting this at the Sandboxie forum.
The idea behind Sandboxie is excellent.If they can improve this program it will be well worth using.
Link below...

http://www.sandboxie.com/


Sandboxie Installer (Windows 2000, XP, 2003, Vista; 32-bit)

Sandboxie Installer (Windows XP, Windows Server 2003; 64-bit)

- If you're not sure which installer to download, get the 32-bit version.
- At this time, Sandboxie does not support Windows Vista 64-bit

Sandboxie 3.38

Changes

- Spanish translation
- Software Compatibility tool (in Configure menu) detects software on the computer and applies necessary configuration
- New "X" icon is displayed while deleting the contents of a sandbox
- Improved support for Windows 7 (Release Candidate build 7100 only)
- Freeze/lock-up in web browsers due to a problem in Immediate Recovery
- Color border option (in Sandbox Settings > Appearance) appears on secondary monitors in a multiple-monitor setup
- Minor problem on Windows Vista when deleting files in a Windows Explorer running under Sandboxie
- Support for keyboard navigation in Sandboxie Start Menu
- Resolved problem with Microsoft Office products freezing/locking-up when opening documents in a Forced Folder
- Some performance improvements due to optimized registry access
- Error SBIE2313 Could not execute SandboxieRpcSs.exe (267) caused by blocking access to some folders through Sandbox Settings > Resource Access > File Access > Blocked Access
- Improved compatibility with Online Armor
- Improved compatibility with ZoneAlarm Internet Security Suite Version 8

http://www.sandboxie.com/index.php?DownloadSandboxie