ITunes 10.5.2.11 asks for my login information at every startup of the software?

Any Assistance would be appreciated.

Two things to check:
1. First to check your Windows system files for possible file corruption:
START / ALL PROGRAMS / ACCESSORIES / right mouse click "Command Prompt" and select "Run as Administrator"
In the Command prompt window, type in
SFC /SCANNOW
Hit "Enter" key
This will scan, fix and update windows system file.
Restart computer after it's done and see if it helps.
2. Scan your Computer in Safe Mode for possible Malware:
Start your computer in "Safe mode with networking", go to CNET's download.com to download a free version of Malwarebyte. Install and perform update immediately, then do a full SCAN. Remove malware if it indeed finds any. Restart computer to regular windows to let Malwarebyte complete the removal.
To start your computer in safe mode
Remove all floppy disks, CDs, and DVDs from your computer, and then restart your computer.  
Click the Start button , click the arrow next to the Shut Down button , and then click Restart.
Press and hold the F8 key as your computer restarts. You need to press F8 before the Windows logo appears. If the Windows logo appears, you'll need to try again by waiting until the Windows logon prompt appears, and then shutting down and restarting your computer.
On the Advanced Boot Options screen, use the arrow keys to highlight the "safe mode with networking" option, and then press Enter.
Log on to your computer with a user account that has administrator rights.
When your computer is in safe mode, you'll see the words Safe Mode in the corners of your screen. To exit safe mode, restart your computer and let Windows start normally.

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