to switch from networking to softwares.

hello sir,
i am a BE graduates in Electrical Engineering from OEC.,Bhubaneswar. currently i am working in a reputed company as a support analyst in Computer hardware and networking field.i’ve a great interest to become a software developer.i got 59.6% in my BE.so canyou suggest me how i can achieve my goals? i am still confused whether i’ll go through Linux or Ms-.Net? can you suggest me in which way i’ll go to achieve my goals? if in Linux, which ourses i should do to achieve my target?waiting for your reply.my e-mail id is : sudeeptaganguly2003@yahoo.com .egearly waiting for your reply.
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sudeepta kumar ganguly