iTunes cannot backup iPhone because a backup can't be saved on the computer

[tujuh777]

Hey guys, yesterday i tried to jailbreak my iphone 3gs, but i completely messed it up. when redsnow asked me about if my 3gs was the old one or the new one, i selected the new one. (3gses made between week 1-40 would be old, and 45 above would be new). and mine was the 44th, so redsnow said that the results will vary. so after i selected the option new, i continued to jailbreak. when my phone got to the pineapple screen, it suddenly shut down and it showed the "you need to plug your iphone to your itunes screen" where you need to do a system restore. after i done the system restore, i pressed backup, but then it showed the error message. please anyone, i need help. i tried redoing it but the same result came up. i googled this and came to an apple discussion thread where you just need to change the recent logs. but i dont understand how. can someone please help me? im desperate

thanks

here is the website i tried to follow, can someone give an explanation about this please?
https://discussions.apple.com/thread...art=0&tstart=0​