Fail to install app, Fail to restore backup, Fail to restore factory mode

Question

Thanks for all the help in advance, I am really desperate at the moment.
Any hint will be appreciated
_*Device and environment*_: WiFi ipad iOS4.2.1,
Synced to a XP sp3 computer with itunes 10.1.2, no virus malware guaranteed, security/antivirus softwares turned off and on with no difference in symptom
*_History of problem_*
1. ipad was bought last year and was on IOS3.2.2 ever since,
I bought about total of 40 apps with 3 iTunes accounts, I didn't go to IOS4 because I liked the rotation switch and doesn't need multitask. Never jail break or even attempted
2. Mid Jan, when I try to update the apps, iTunes start to give error such as
*App cannot be installed, or internal error occurred*
Error codes are normally
0xE800000C
0xE8004006
3. I reboot the ipad and tried again, still same error, so I think I should restore to the earlier backup
Then it says *ipad cannot restore to backup, an internal error occurred*
4. Then I decide to restore to the factory first by setting it into factory restore mode,
in such mode, itunes hang at the *"Preparing Ipod Software For Restore", it takes about 10-20mins then say it cannot restore*
*Error code: 0xE8004017*
5. Without my knowledge, my wife bought it to apple store when she go downtown, the guy over there then restore it to a factory ios4.2.1. And told my wife there may be problem with my computer OS. I was not there so I don't know what exactly he said or did, but apparently it only took him no more then a few minutes in total
6. I tried to restore the ipad to my backups so I can get my settings and apps back, same error occurred, says *"restore to backup, an internal error occurred"*
7. I then decided to forget about my settings, just install my apps, a couple apps installed correctly(e.g. doc2go), most (include ibooks, accuweather...) showed same error poped out
App cannot be installed, or internal error occurred
0xE800000C
0xE8004006
8. At this point I was very frustrated. I called apple support, they asked me to *reboot ipad,*
*reboot computer,*
*removed itunes, quicktime and everything*
*and reinstall,*
*log in with another user name,*
*turn antivirus on and off, uninstall all antivirus*
totally 2 hours spent on the phone.
Still no success,
Then they asked me to format my computer and reinstall windows, I refused.
And they suggested that I bring it to apple store again, I asked them whether apple store will simply restore it to factory mode again like they did, they said yes!
Then I refused because it would not make any difference than the current state, I still have to install my apps myself afterwards
I tried search in here and everywhere and nothing really pop up,
any hint will be really appreciated!
THanks again
Message was edited by: offall
Message was edited by: offall
Message was edited by: offall
Message was edited by: offall

Answer 1

same problem here except i'm using an iphone 3gs. error occur right after i upgrade my firmware from 4.3.4 to 4.3.5 then worst windows cannot detect my device. Anyboby..., pls any hint to resolve this problem. not able to use my phone two days now. tnx in advance.