I have android studio installed on my windows operating system 64 bit 4 gb Ram but now i want to work in linux(ubuntu 12.04)which is installed on the same windows 7 (no separate partition)where the android studio is installed so will it cause any harm to my windows operating system or any performance issues.Searched a lot about it on google but no clues.Any suggestions are highly welcome.
If you're using Dual Boot then it shouldn't slow down your system at all. Although it won't make sense to have Android Studio installed in Windows when you have it at your Linux since you might get confused on which OS you saved which project. It won't slow down your system because your Windows OS only "sees" the HD Partition for Windows, the same is the case for your Linux Partition.
That being said, Linux can only see and touch the resources in the HD allotted for Linux. And since you won't be able to run the two OS at the same time, you won't have RAM problems (which is a problem with Virtual Machines).
Also, if I am not mistaken, when you dual boot, strictly speaking, you are partitioning your Hard Drive. When you go check Windows' Drive C, it's no longer 500GB (or whatever the total size of your HD is).