While you might expect this extra layer of protection would slow down your browsing a little, there was no noticeable change on our test PC (and IE told us the add-on took a mere 0.03 seconds to launch). If you're running an old underpowered laptop then maybe you'll see a performance impact, but otherwise there are unlikely to be any problems.
Otherwise the program seems very compatible, running on 32 or 64-bit Windows XP, Vista or 7, and all versions of Internet Explorer from 6 to 9.0, and is most unlikely to conflict with any other security software. So if you use IE, even only occasionally, then Browser Guard 2010 offers an easy way to gain a little extra protection from malicious websites.
A valuable extra layer of protection for your IE-related online activities