I'm using windows 7 and the uac is triggered everytime i start mbam whether i start it from link or context menu scan. Anyway to stop this?

Only way is to disable UAC, which is not recommended.

The reason behind this is that Malwarebytes' Anti-Malware needs administrator privileges. How do you expect it to scan a hard drive and delete malicious files without administrator privileges. There is just no way around this architecture.