Thank you all for you input so far in this thread. It would seem that the general consensus is that aside from studying tactics, ending, or practicing and opening the computer isn´t as good as playing human opponents. Maybe if they made a program that gloated when you hung a piece it would seem more realistic, although I think someone told me that Fritz talks trash when mess up, lol.
Can I really learn chess by playing against the PC??

Is there any where that you DON'T show up killer????? lol. Can't wait to see you take on the computer and show me how it's done!!!!!

To play in internet is kind of silly, because you will be playing against computers without knowing it), so why waste time, and not playing directly?
lol... so why you're still here tombarolo?
Surely it isnt that common.

Can you elaborate any more on what the IM said about playing against the computer tombarolo?
Thanks also for your input kenpo, you made some really good points!!

Not really, I'm afraid. The best method is playing against humans, and then analysing your games for errors, using your brains (not engines and such).
The playing part is the fun one, the analysis is the serious learning procedure. At some time, you MAY use an engine to check for tactical errors, but initially the analysis MUST be done by you, and your brains- no assistance allowed.

I think you can. And although it looks like Chessmaster is becoming harder to find I think its one of the best for learning the game. Sometimes its hard to find a OTB game. My 2 cents.

Play against the ~highest level but take a lot of time for yourself and give the comp about 10mins this is far more challenging than you think just make sure to assume you are playing the middle game after your first move
I play computers often, and my experience has been that few make good realistic opponents. They excel tactically, where many humans are weak. Also, timed games are unfair because of the computer's ability to think much faster. However, most computers have an 'undo' feature that allows the correction of mistakes, and I find that very useful for strengthening my ability to notice subtle nuances in the board. Other than that, computers are good for masters and other computers (Which are interesting matches) and while they are moderately useful for training, playing human opponents is much more beneficial.