No I bought the apps with new ID
I can buy apps with new app without any problem but for update it asks password for old ID

That's what I want to do now...
But how can I protect data of apps and apps themselves.
Because nothing is being synchronized.. Only music purchased through iPhone.. Even music files from PC are not transfering to iPhone
and how can I restore iPhone to original factory settings?

Have tried it but not working
I think problem is little more
any new app that I am installing is not being copied to PC after snyc
it do says copying apps but actually it does not
seems like this problem is after blackra1n

Well there is my new ID
signout and signed in again
still problem is there
I can make New purchases with new id but only problem when update is available

Old apple ID is valid but I have not purchased apps through old one
I bought with new ID but for update it asks automatically password for old ID
old id has nothing to do with all this.

I have a very strange problem.
I was using before another email as apple ID
I changed to new one but I am facing strange problem.
I can buy from AppStore with my new account buy when ever an update of app is available and I click to update it.. It asks me password of my old id..
And if I give ...