I can't uninstall and reinstall itunes?

Question

Hey,
For the past few months I have had several problems with Itunes.
1. I can't use the itunes store because the screen in itunes store is completely white
2. I can't install the updated version of itunes and quicktime, I get error messages
3. I can't uninstall itunes because it says itunes doesn't exist
4. I can't install itunes again from the website because it gives me error messages and shuts down
5. I can't install or unistall itunes at  all from any location

Answer 1

You likely have a deepr problem either with Windows or malware on your system.
Sounds like you need to backup your files and do a factory restore of Windows:
Once you've done all this Windows will be extremely responsive, and iTunes likely will run with no issues at all.
Factory Restore instructions:
1: Backup all your files to cd/dvd. if possible as it's write/delete protected or a hard drive.
2: Consult your PC vendor site how to do a "factory restore". Old machines used a disk, new ones have a encrypted locked partition on the drive someplace usually called "Recovery". Before you start, make sure the computer can't connect to the Internet. This may mean turning off your router and disconnecting Ethernet cables. You need power and you need to set the screensaver & monitor NOT to activate or sleep in your Control Panel (and set again after you restored)
3: Note that your going to lose everything, that's the object. And get the machine like it was when you bought it. (All self installed programs you'll install again from fresh sources later)
The factory restored anti-virus, Flash, Java, Reader, and all old programs on it are vulnerable. These all your going to have to remove, along with the PC vendor bloatware, trial ware, games and other garbage. In your Add/Remove Programs. If you don't do this, these old programs will get online and do a update and your machine can get pawned. Why you don't want a internet connection until they are removed. You just want Windows and nothing else. Enable your Windows Firewall in Security.
4: Now get online with a wired Ethernet connection to a fast Internet service at home, because (Vista over 200 updates, 2 days) and Windows 7 (SP1 + Win Live, a few hours) is going to take some time.  Windows Update is in your Control Panel/Security or Start Menu > All Programs.
Install and activate the free Microsoft Security Essentials or free Avast anti-malware the first chance you get.
When doing Win 7 SP1, if it seems to stop, there is a Windows Live window behind the update window that needs to be "ok-ed" before it continues.
Vista updates are going to be especially painful, just rinse, reboot and repeat over and over until you get them all and there is nothing more it will give.  Check the Start Menu > Shutdown for a indicator that it's going to install updates and perform the restart.You must keep clicking the "check for updates" until it's really clear.
5: Once the updating pain is over, you need to do a Windows Disk Cleanup and a Defrag before adding programs. (important for speed!) This can take hours. Will make Windows considerably faster.
6: Optional (good for notebooks): You can head to Performance > Advanced Setting and tone down Windows eye candy. Set to custom and delete everything but four options, the thumbnails, font and box smoothing and the last one. (or Windows will look like basic XP)
7: Make sure you do a System Restore Point of this "pristine" and very fast Windows. If you have the ability to make System Restore Disks and Images to DVD's DO IT!! Save yourself having to do this again one day.
8: Now install your programs and plugins: Flash, Java, Firefox 4 (fastest and the best) VLC, LibreOffice. CCleaner. etc.., Recommended sites: Qualy's Browser Check/ Mozilla Browser Check.
9: If your computer is still slow, check the RAM. Windows 7 & Vista needs 2GB just for themselves. So add more to your 4GB max (or more if your on 64bit). Check Crucial.com to make sure you get the right RAM specs for your computer.
10: Do a malware scan of the external drive/cd/dvd's before transferring files, always download new versions of programs from fresh sources so they are free of lingering malware. If all possible, use a Mac or Linux machine to scan for malware as they are much safer operating systems by default. Free ClamXav for OS X, ClamWin for Windows, Clamav for Linux. Update those malware definitions before a scan.
Good Luck!
Note: I recieve no compensation for free product or site mentions.