A number of security issues have been fixed in Opera, click [URL=http://www.opera.com/windows/changelogs/752/]here[/URL] to see the full changelog.
"Fixed a URI obfuscation weakness enabling impersonation of legitimate web sites. Illegal characters in addresses will be stripped. This addresses Security Focus [URL=http://www.securityfocus.com/bid/10517]Bugtraq ID #10517[/URL].
Solved frame injection vulnerability that allowed for spoofing (Secunia Advisory [URL=http://secunia.com/advisories/11978/]SA11978[/URL]).
Solved certificate verification problem."
Click [URL=http://www.opera.com/download/index.dml?opsys=Windows&platform=Windows&lng=en&ver=7.52]here[/URL] to download version 7.52 now.