What's happening? Please help!

Question

I have a ipod and ipod nano, at the beginning,
I install the itunes by the dise with the ipod.
It's work, and every things go well.
2nd time, after recovered my PC,
install the itunes once again. It dosen't work!
Whatever using the dise with the nano's or download the latest version on the net, recover the computer again,
reinstall the itunes, IT DOSEN'T WORK!
the result is just like that:
1) After install the itunes and quick time,
it said okay and need to restart the computer
( But it also said that the itunes have problems,
need to close the progarmme)
2) Restarted the computer, click itunes
same small window come out
---> the itunes have problems,
need to shut down the programme.
By the way, it doesn't show that what the error is.
3) I'm using window XP home edition
This bores me! Someone know the solution?
thz a lots!

Answer 1

Perform a Thorough & Complete Uninstall and Reinstall of iTunes/QuickTime
(Compiled from the collective wisdom of toonz and Da Gopha)
If you want to guarantee a successful upgrade and be proactive about minimizing potential install issues, do the following:
1. Completely Backup your music and iTunes library files.
2. Virus check / spyware scan your machine.
3. Completely remove / uninstall the current version of iTunes and QuickTime from your system.....
3a. - Turn off all security software such as Norton, McAfee, SpySweepers, any TSRs, etc. (exit via the system tray)
3b. - Do a Stepwise clean uninstallation of iTunes
3c. - Then download and install the Microsoft Installer Cleanup Utility
.....And make sure iTunes is really gone.
4. Delete the contents of your temp folder: C:\Documents and Settings\<username>\Local Settings\Temp
5. Reboot the PC
6. Turn off all security software such as Norton, McAfee, SpySweepers, any TSRs, etc. (exit via the system tray)
7. Start with the QuickTime standalone installer run from the PC (not directly from on-line)
8. Reboot the PC
9. Turn off all security software such as Norton, McAfee, SpySweepers, any TSRs, etc. (exit via the system tray)
10. First completely download, then run the latest iTunes Installer from your PC
11. Reboot the PC
The majority of problems out there on the discussion boards are caused by viruses or other system corruption — sometimes self-inflicted by the user (i.e. - people who turn off necessary Windows services) — or out of date drivers. You may want to consider this if your PC falls into one of these categories.