Hey I'm having problems connecting my phone to my computer through USB.

When I first bought my samsung galaxy sII in july up until 4th August I was able to connect my phone to my Windows 7 64-bit PC through USB without any problems. While connected to my PC, my phone was under "MTP Application" and it showed "Connected...". I could right-click my phone under My Computer and choose "import pictures and videos". I could also connect to Samsung Kies and backup.

However from 5th August up till now, whenever I access my phone folders that have many files (e.g. Images, Music) through my computer it disconnects (phone shows "Initialising...) (then reconnects again immediately (phone shows "Connected..."). But somehow I can access the camera photos folder (in phone memory) although it has many files. Therefore I can't use the "Import pictures and videos" anymore. And samsung kies cannot detect my phone at all.
However the weird thing is that I have NO PROBLEMS using it in USB Mass Storage Mode.

I like to use "Import pictures and videos", and to use Kies to backup (since I don't want to root my phone yet)... However now I can't do any of these...

I have tried switching my phone on and off, reinstalling drivers, reinstalling Samsung Kies, however it did not work at all. I also tried to tick "USB Debugging" and "Allow mock locations" under Settings-->Applications-->Development and allowed my computer to install more drivers. However once i untick both the settings, it's the same problem again.

From what I remember the only difference between 4th August and 5th August was that Samsung Kies updated itself, and that on 5th August when I plugged my phone into my PC through USB my computer automatically installed drivers again.

Can anyone please help?

p.s. Sorry for the lengthy post, trying to provide as much information as possible...

Hmm I haven't tried that but I'll try that now. But if I don't have Kies how do you update my firmware. I am aware that I can backup using MyBackup Pro (without rooting) so I am not worrying with backup.