After I open a bottle of red wine how should it be stored and for how long will it be good?

There are a variety of factors that come into play here, namely;
* Average room temperature
* Temperature range
* Amount of wine remaining in the bottle
* Style of wine.

Now a cooler room temp will enable the wine to be keep longer, room temp is considered to be 18C.
Small Temperature range is better, plus or minus a couple of degress.
The more air in the bottle the faster the wine will oxidise.
Big heavy reds, like Ozzie Shiraz, are more forgiving than light, Gamay, stlyes.

Now for the length of time to keep an open bottle.
From experience, I would say MAX of a week if in a fridge and no more than 3 days if at room temp, unless it's a very cold room.
After this time the wine starts to suffer from oxidisation and looses fruit and balance.
All this assumes that all you are doing is just putting the cork back in the bottle to seal it.
There are a number of "wine saving" stoppers on the market that remove excess air from the bottle in the hopes of keeping it fresher longer.
One of the better ones is called Vacuvin. If one of these systems are used you may double the keeping times.

Hope this sheds some light on your problem.

When is anything to do with drinking wine every a problem?

Savage, too true.
The only problem I have is finding the corkscrew ;)

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Originally Posted by TheSavage

When is anything to do with drinking wine every a problem?

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Three situations, in my experience:

Opening a bottle when I'm the only one around, and ending up not having to worry about storing the remainder.
Wine-in-a-box. And I mean the stuff that's low end even for wine-in-a-box.
Running out :)

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Originally Posted by moserk

After I open a bottle of red wine how should it be stored and for how long will it be good?

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If it's a corked red wine, it can be stored in the refrigerator 3-5 days, Even white wine, sparkling, or champagne will survive like this. The ideal situation would be to keep the opened bottles in a cool place away from direct light. If your going to store them for a few weeks it's best to store them on their sides ather than upright (corked varieties), because it'll keep the cork moist and airtight. White wine and champagne can also be just chilled before serving also. The idea conditions for wine is to store them in a temperature of @ 55 degrees, with a humidity level of about 70-80%.;)