X3 2004 Creaking Noise & Mix Tires problems

[msalam]

Dears,

i have two main problems in my X3 2004 car where the dealer in KSA is unable to troubleshoot or pinpoint how, where and all those questions!

the first problem is the creaking noise which comes from all the doors (or windows) when ever i drive over a non smooth road (which in KSA-Jeddah happens to be most of the roads). the dealer is saying this is an X3 problem and there is no solution, but its so annoying and no one can understand this is a BMW. whenever i lower the noise mostly disappears. so anyone passed through this problem and is there any solution?

the second problem which caused the dealer to get me a new gear box thinking the problem resides there but it wasn't from the gearbox. the problem is, whenever I'm accelerating (RPM goes above 4) some hard shifting will occur repeatedly (shifting is not the right word i guess, it feels like if 2 cylinders are moving together and there is a teeth in one of the cylinders broken, so there will be a shift whenever the first cylinder reaches that broken teeth). The only thing i was able to pinpoint is that my tires are mix (18in 255 rear & 18in 235 front) whenever i replace the tires with one size all (18in 235 rear & front) the problem will go away; some technicians said it might be the transfer box. if I'm driving in traffic and slow pace, alot of bubbing sound will come from the rear. again anyone passed through any similar problem.

last problem, my windows used to go down and up by pressing the key once, after i took it for maintenance check, i lost this feature, and the dealer guys are saying i don't have that feature ....so any clue how can i get this feature back.

thanks for your help