I dont know how to connect it to my laptop

Unfortunately there is no audio input on most laptops so you need another solution. You can use a simpler RCA to USB input like a Behringer U-Control USB Audio Interface (UCA222) but this will require you to make of buy a couple of 1/4" to RCA cables, watch the level though.
If you are looking for something more pro then I would suggest something like a BehringerU-PHORIA UMC204HD which has XLR inputs and is better suited for your mixer.
There are other companies that make audio to USB interfaces, M-Audio, Focusrite etc, but they are not cheap

Great question but you do not give ANY detail at all. Is your laptop a PC or Mac? What O/S is it running and what version? What is it you are trying to connect? How are you connecting it -USB/RS232/Mouse Port/Printer port/VGA/HDMI there are so many possible interfaces needing drivers I could go on and on but please if you want help gie as much detail as possible or visit a mind reader.

First, connect the USB audio interface which came with the Xenyx to a USB port on the PC. Then connect the TAPE OUT from the Xenyx to the IN of the USB audio interface. And connect the OUT of the USB audio interface to the TAPE IN of the Xenyx. You should now be able to record from any of the Xenyx channels. To listen back, engage the control room button which reads CD/TAPE. Contact me if you need any clarification.

Your Windoows Vista MUST have Service Pack 1 installed. Check that SP1 is installed.

Yep! Get a decent audio interface that attaches to the PC with a USB connection and uses BALANCED lines to your mixer. I use a UA-25EX Roland/cakewalk as an example. (about $200 and there are cheaper units such as M-Audio Fast Track MKII ) Note these interfaces BOTH record and playback with two channels for stereo.
Essentially the audio board that is in PC's and Laptops are too near the switching noise of the processor and some of that is just bound to get into the audio lines as they don't even have balanced audio lines from the computers. Make sure you use either TRS or XLR balanced cables from whatever interface you get. Also connect ALL interconnected equipment to the same power source or receptacle. You can try to reduce the buzz with the mixer EQ's with what you have, but that sacrifices audio quality.

there is a main output, conect it to the aux in line or to the microphone line.good musics

It is happening because you have a ground loop. You need to check the ground on your amp. If it is an old one that does NOT have a three wire cord, you need to have that changed. Failure to do so could also damage the interface. ALL your equipment, computer and guitar am should be powered from the same receptacle. If you have other devices connected to your laptip such as printer, they too MUST connect to the same receptacle or plug strip. Any phone lines should be disconnected from the laptop. Make sure everything has three wire cords. The interface probably sends out line level, so you should use a low gain input of the amp and use very little gain as the interface probably has 20 or more Db output than a guitar.

Your machines are different and likely have different interface chipsets. Some newer machines have more built in plug-n-play than others. There is so much incompatibility that it is a wonder that any of the stuff works together. You need to install the needed driver... NOTE: there is a lot of incompatibility between OS versions... so if for instance you are using XP on one machine and Vista or Windows 7 on the other there are a LOT of incompatibilities. ALWAYS check the requirements for the computer with the specs of the device to be connected. MOST of the problems are due to OS variations. Check for driver updates on the Sony site

The 2442FX has a built in usb interface so there is really no need to use the Tascam. Here is a link for you:http://www.behringer.nl/EN/Products/2442FX.aspx

Any pro-audio interface with a midi input would do the trick. There are numerous products out there that offer this. You can get a simple usb midi interface, and connect the Yamaha up with a midi cable running from the midi out of the drum module to the nidi in of the interface.

one of the simpler ones:...

http://www.amazon.com/M-Audio-Midisport-Uno-MIDI-Interface/dp/B00007JRBM