Since you have not explained how you have configured GMail and Windows Live Mail, I'll list the steps to set this up below.
If you confirm whether this matches what you've done, this might enable others to help?
Access a Gmail Account in Windows Live Mail Using IMAP
- Make sure IMAP access is enabled in Gmail.
- Select Go | Mail from the menu in Windows Live Mail.
- Hold down the Alt key if you cannot see the menu bar.
- Click Add an e-mail account at the bottom of the list.
- Type your Gmail address under E-mail address:.
- Type your Gmail password under Password:.
- Enter your name under Display Name:.
- Make sure Automatically determine my login ID is checked. (You can verify it is working correctly if the local part, i.e. what comes before the @, in your Gmail address appears under Login ID:.)
- Type your Gmail password under Password:.
- Make sure Manually configure server settings for e-mail account. is checked.
- Click Next.
- Make sure IMAP is selected under My incoming mail server is a _ server.
- Enter "imap.gmail.com" under Incoming server:.
- Make sure This server requires a secure connection (SSL) is checked under Incoming - Server Information.
- Type "smtp.gmail.com" under Outgoing server:.
- Make sure This server requires a secure connection (SSL) is also checked under Outgoing Server Information.
- Also check My outgoing server requires authentication.
- Type "465" for Port: under Outgoing Server Information.
- Click Next.
- Now click Finish.
- Click OK.
- Select Tools | Accounts... from the menu.
- Highlight the Gmail account in the list.
- Click Properties.
- Go to the IMAP tab.
- Enter "[Gmail]#Sent Mail" (not including the quotation marks) under Sent Items path:.
- Type "[Gmail]#Drafts" under Drafts path:.
- Type "[Gmail]#Trash" under Deleted Items path:.
- Enter "[Gmail]#Spam" under Junk path:.
- Click OK.
- Click Close.
- Shut down Windows Live Mail.
Source: How to Access a Gmail Account in Windows Live Mail
