Hi Shaics,
Welcome to Apple Support Communities.
It sounds like iTunes may be failing to launch on your PC. Take a look at the suggestions in the article below and try the suggested isolation and troubleshooting tips.
iTunes for Windows Vista, Windows 7, or Windows 8: Fix unexpected quits or launch issues
http://support.apple.com/kb/TS1717
If iTunes for Windows Vista or Windows 7 won't open, stops responding, or unexpectedly quits, try using the steps below. You may want to print this document before following these steps.
Open iTunes in Safe Mode to isolate any interference from plug-ins or scripts not manufactured by Apple.
- Hold down Shift–Control while opening iTunes. You should see a dialog that says "iTunes is running in safe mode" before iTunes finishes starting up.
- Click Continue.
- See if the issue you're experiencing persists in Safe Mode.
If you have the same issue while iTunes is in Safe Mode, proceed to the "Create a new user account" section. If you don't experience the same issue, follow these steps to remove third-party plug-ins.
By creating a new user account, you can determine if the issue affects a specific Windows user account or all accounts. Follow the steps below to create a new user account in Windows Vista or Windows 7:
- Choose Start > Control Panel.
- Open "Add or remove user accounts." (If you're using the Classic view in Windows Vista, open "User Accounts," and then open "Manage another account.")
- Select "Create a new account" and follow the instructions to set up the account.
- Once you create the new account, choose Start > Log Off.
- Log in to the new user account.
- Open iTunes and see if the issue you're experiencing persists in this new user account.
If you have the same issue in the new user account, proceed to the "System-wide troubleshooting" section. If you don't experience the same issue, proceed to the "User-specific troubleshooting" section.
Manipulating or incorrectly changing the time setting on your computer can cause iTunes movie rentals to stop playing on Windows. Follow these steps, if movie rentals stop playing in Windows.
-Jason