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While package managers like PIP for python are easy to use and usually work flawlessly, there can be cases when things fail. While installing the pyAudio package for python in Windows using command pip install pyaudio I encountered error: Unable to find vcvarsall.bat the reason for this error could be many but usually means the library you are trying to install contains some C/C++ code and pip needs to compile them to get a binary. On Windows PIP tries to do that using Microsoft Visual Studio's compiler and when it is unable to find it, throws the error below. Luckily, the solution is very easy as shared ahead.

There are numerous hacks, tricks and exploits to bypass various kinds of limits imposed on mobile data usage by cellphone carriers. No matter how much carriers try to block them, users always find new ways and proxies to bypass them and access mobile data on there cellphones for free.

Airtel and Google have now collaborated to offer free mobile internet access to Google service on cellphones. Suitably named, Airtel Free Zone powered by Google allows users on Airtel network to use Google+, Gmail and Google Search without incurring data charges and even without an activated data plan. Any internet enabled phone can be used to access Airtel Freezone services, only phone's default browser should be used with Opera Mini as the only third-party web-browser supported.

As for the limitations :
1). The free-ride is available upto a fair usage cap of 1 GB per month.
2). Navigation to first page of a website linked from the Freezone search result page is provided free, but further deeper navigation to website would incur data charges however before you are charged, you will see a warning page with the option to sign up for a data plan if you want.
3). Clicking on any pictures and downloading attachments will also incur data charges after warning and opt-in.

New versions of ESET Smart Security and ESET NOD32 Antivirus are out now for public download for BETA testing. These new version of ESET Smart Security 7 (Beta) and ESET NOD32 Antivirus 7 (Beta) feature many improvements, most noticeable being improved ESET Anti-Theft feature, improved Anti-phishing and numerous improvements to the ESET Personal firewall. The new scanning engine is able to handle heavily-encrypted threats that evade detection with Advanced Memory Scanner, the Vulnerability Shield allows users to stay protected from threats or attacks trying to exploit network vulnerabilities and improved cleaning engine which allows it to eliminate extremely persistent malware and rootkits. ESET is also giving away free One year license keys for ESET Smart Security 7 to 500 lucky BETA testers.

Amazon offers some excellent cloud computing services, but being self-managed at the basic level it can be a headache to diagnose and fix errors. I recently encountered a similar error where all my attempts to login into the EC2 instance failed with cloud-init: runcmd Caught exception reading instance data: http://169.254.169.254/2009-04-04/meta-data/security-groups as shown in the Amazon EC2 instance console system log below.