Running as Admin with UAC disabled is a sure way to install a malware/spyware virus before you know it, which is why Admin/root accounts don't usually even allow direct logins by default in either Windows or Linux. It makes you easily susceptible to malicious websites exploiting vulnerabilities in a browser to execute privileged code as root. You may think you don't have a virus, but then the malware authors may have just wanted you to keep thinking that. 😉 It's not recommended to do that sort of thing, especially on any machine you'll put on the internet.