Sandboxie is a nifty piece of freeware which shields your hard disk from any and all malevolent intent. It’s kind of like running a cache buffer zone which stops malware installing itself on your disk. Run a program or your browser in a Sandboxie zone and when you’re finished you can just delete the zone and start again fresh. Anything that was downloaded or installed during the session is wiped out. The idea is great, especially if you spend a lot of time trying out new stuff, or are just an adventurous sort who blunders around fiddling and poking in different places online.
You could also try a new toolbar add-on, browser extension or just about any kind of software. If you don’t like it, you throw away the sandbox, and start again with a fresh sandbox. On the other hand, if you do like the new piece of software, you can re-install it outside the sandbox so it becomes a permanent part of your system. Sandboxie intercepts changes to both your files and registry settings, making it virtually impossible for any software to reach outside the sandbox. Sandboxie traps cached browser items into the sandbox as a by-product of normal operation, so when you throw away the sandbox, all the history records and other side-effects of your browsing disappear as well.