Google Desktop tweaked to block attackers

Google changes code to avoid an issue in IE.

Due to a bug in Internet Explorer, data of Google Desktop (in user's machines) was in danger. Google has fixed it quite soon and users do not have to apply any patch as they have done it on their end.

But according to the news, Microsoft is still looking into the bug.

Why Microsoft can not make a bugless browser? We know that developing a software without any bug is an (so-called) impossible task. But Microsoft is always issuing patches?