I'm having trouble with my atari 2600 emulator

[Iamerror]

I'm new to emulating games, I don't know alot about computers either. I downloaded an atari 2600 emulator, and some games. Unfortunately I can only get pitfall to work. I use windows, I use an controller that's similar to a ps2 one. The games will load, but no matter what button I push on my controllers, nothing
happens. The strange thing is that I could play the E.T game on it, and then only Pitfall would work. Any suggestions? Thanks

[Zorlon]

Get another Atari 2600 emulator or re-configure the controls within the emulator

P.S. helps if you mention what emulator you are using

Anyway here is a list of A2600 emulators taken from Zophar.net

A26
A26 was written in 100% assembly which is very compact. It emulates sound through the PC speaker,however.

NO$2K6
A Great VCS Emulator! Emulation works with most games known. Precise timing emulation synchronizes CPU with the cathode ray beam. Auto-detects NTSC/PAL framerates & cartridge memory banking types. Emulates joysticks, paddles, keypads, and steering controller. Comes with debugger.

PC Atari
PC Atari is one of the most popular Atari 2600 emulators. It provides a nice GUI, fast emulation, supports all cartridge types, has good support for various controllers (including MS Sidewinder controllers) and supports sound with Sound Blaster and 100% compatibles. It even supports Pitfall 2. It's worth the download. Comes in both DOS and Windows versions.

pyTari
This is an Atari emulator programmed entirely in Python and some common modules. Currently, it requires only PyGame 1.5.0 and Numeric.
Stella Stella is another popular Atari 2600 emulator, which is also the most portable, with ports to Unix, Linux, MAC OS and OS/2. It rivals PC Atari in emulation. This emulator is probably the emulator of choice along with PC Atari. It provides sound emulation and all types of cartridge formats, and the Windows version (formerly StellaX) provides a very nice interface. It's worth the download.

Latest release: 2010-11-13

VCS 2600 This emulator supports sound, has 3 different videomodes, and all different cartridge types, and is an all around good emulator.

Virtual 2600
This is the DOS port of Virtual 2600, although,confusingly enough, Virtual VCS is Dan Boris's port of Virtual 2600! This is an outdated emulator, and provides no sound emulation.
Virtual VCS
This emulator supports many cartridge types. Although it has no sound emulation whatsoever and is outdated, it is still a nice emulator.

z26
This emulator which was written in 100% assembly is based on of Paul Robson's A26 emulator. It generates sound through the SoundBlaster perfectly, and runs most Atari 2600 games at an excellent speed on Pentium Class CPUs. It also supports games with the Parker Brother's chip and TigerVision's chip. There is now also support for paddles, the Stelladaptor, and Atari Trak-Ball controllers. It is without a doubt one of the best Atari 2600 emulators out there.

[Iamerror]

Sorry, I was using the Stella emulator. Thanks for your help.