Can i have IIS and Appache server in the same mechine?? will it cause any problem. At least for study purpose??

First: YES Second: For what? I assume you talking from Apache?! You could have both installed, but only one running! Why you want drive a bicycle from the scrape yard (IIS) and a 18 wheel turbo loaded truck (Apache) the same time? Compare: Linux with Apache= 386'er with 64MB Ram and a 20GB HD running nice, now try the same with IIS! Or compare the bug fix from Apache with IIS, IIS more than 280 with some majore once unsolved. 3 by Apache but only one for UNIX, two are for Windows!! Buy a distribution of Linux (@ $ 100) and in 2 hours up and running, it's you first time workin with Linux then quote 2 days! For security resons use only Apache on Linux!