[Behi]

There are some EXCELLENT and FREE lecture videos from Stanford, MIT, Berkley, and other universities available on iTunes U about Operating Systems, Algorithms, and Data Structures. Each sessions is about 1 to 2 hours. So if you do things step by step, it should be possible to watch 2 lectures per week, 1 course per 2 or 3 months.

Here are the links:

Operating Systems and System Programming: http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewPodcas...

Introduction to Algorithms: http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewPodcas...

Data Structures: http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewPodcas...

There are other series available on iTunes U as well, but don't worry, relax, do it step by step and then you might want to have a look at the rest of the series too.

[learnguy]

you can also find lots of free lecture videos with free access. http://www.freelecturevideos.com is one of those sites I have run into that features lectures of all kinds.