car wont start

On sunday .. i tried to start my car... didnt start so i jumped it and went to buy a new battery... installed the new battery but somehow managed to blowout the fuse... then i just finally got a new fuse and boom it started up... On wednesday i tried again to start my car and again it didnt... so i changed the battery and it started... this is really makein me mad... what is wrong with it????

On sunday .. i tried to start my car... didnt start so i jumped it and went to buy a new battery... installed the new battery but somehow managed to blowout the fuse... then i just finally got a new fuse and boom it started up... On wednesday i tried again to start my car and again it didnt... so i changed the battery and it started... this is really makein me mad... what is wrong with it????

Alternator?

Yes it is your alternator. When you install the new battery, it is fully charged. You drive around, and your alternator isn't doing it's job so your spark and injector pulses (not to mention your stereo if you are using it) are draining your battery. Soon it gets low enough that it won't start anymore.

There are things in your car that draw current when the car is off that may not be as obvious as the lights being left on. Make sure there isnt power still going to an alarm or an amp or a cd changer or something.