Which program will I loose if I choose to work with Linux, due to compatibility issue? and how difficult is it to adapt to Linux?

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Nothing you will loose. It depends what you want to do in your OS.

One point it may bug you the Microsoft office package . In linux Open office org is there. The alignment of both the thing is not same.

Anyone of average intelligence can learn Linux---you simply have to install it and start using it.

In a sense, you will loose most programs that you used to. Many Windows programs **can** run on Linux--using WINE--but there are linux equivalents for almost everything. Many of these are arguably better that their Windows counterparts.

What are you trying to install? Its not that hard to switch to linux.

Brazil is in the process of converting all the schools to Linux: 43000 done so far. If children (to say nothing of teachers) can make the switch, so can you! Get a live disk of Linux Mint. That will enable you to try it (a bit slowly) without installing, to see if you like it. This is a good list of alternatives to Windows-ware:
http://linuxappfinder.com/alternatives?page=3

What do you usually do on your computer? Do you browse the web a lot, play video games, make graphics, or something else? Your question really depends on what you do.

I have a Windows 7 computer I use for gaming since most games I play don't support Linux. I personally use Linux more as a home server for DVR, asterisk, home automation, and whatever other projects I come up with. But that's just me.

I used to run Slackware linux as my primary OS but back then I was using it for different purposes. Back then I used it for the Internet and programming. Pretty soon here I will be repurposing an old Laptop to run Linux for web surfing so I can have a more mobile laptop than my gaming one It runs very slow in Windows XP.

If you are interested in Linux I would recommend trying it out first. There are distros like Fedora that will allow you to boot off a CD and give it a shot before you do a full install. That way you know what you're missing or not missing before you go all in.

Linux looks and works very similar to Windows so I don't see why it would be too difficult to use it for day to day things like web browsing.