Windows 7 - windowed mode in games!

Hello everyone!! im new to the forum but i have been a (anonymous) part of the community by reading the forums searching for answers or even just reading to spend time and learn a few things...
here's the thing... i like to play mmorpg in my laptop... not the most demanding ones but i like to play wow, aion, perfect world international, even DOTA and stuff like that... i used to play on an old hp pavilion 4 but now i bought a samsung with a geforce 330m 1gb... but well, my question is...does playing in windowed mode affect:
a) performance of the game ( i know generally you get better fps at the cost of some quality)... or that's what i've read
b) life/performance of the video card/chip
c) "life" and performance of the processor
but i mean like "small" resolution windowed mode... like mmm half of the screen but "centered"... so one can see, for example, the taskbar and the desktop around the game screen...
i ask this because i used to play like that on my old laptop... and after a year, either becaouse of driver/memory/video chip/something but i wasnt able to play anymore (the "display driver stopped working and has recovered") issue... which i never found solution so i bought this new samsung rf410 (i have low budget), with intel i3 330m, 4 gb ram, nvidia geforce 330m... i dont want to play demanding games, just the mmorpgs i mentioned... but i really want to know if there's any problem by playing in windowed mode, cause i dont want to mess something again and wouldnt be able to play anymore... thanks for your help in advance!!

Mainly the thing I would keep an eye on is heat. No matter what game you are playing there is still a lot of heat that builds up in the laptop. I would suggest getting a laptop cooler that uses fans to cool the bottom of the laptop while gaming this will extend the life of the machine. Also keep an eye on dust clogging the vents which is another thing that will add heat inside the laptop making it give errors while pushing the machine with gaming.

oh ok, so then for the components, windowed mode wouldnt be a problem in terms of performance or life or any internal problem, but then i should just keep an eye on heat... perfect! i have a laptop stand with one fan which i can move, ill always have it there anyway (without turning the fan on all the time, just while playing)... but maybe i should get another one with more fans xD... but thanks, then i wont worr about anything but heat

thanks a lot for your answers guys!! i dont feel that worried anymore hehe ... one last question... i played yesterday in windowed mode and, just for checking, i monitored the temps from cpu and gpu, and the cpu got up to 80C max, being normally at low 70s... is that too hot for a core i3-330m on a samsumg laptop?? i am investigating about it and seems like it's still not close to the max (105 i think for intel) but i just bouthg the lap this weekend and its on a laptop stand with a fan (a cheap stand but still better than nothing i think)...
oh and the gpu was maximum 68c, so i think that one is safe hehe