Let us know few more things about the issue.
1. In which computer have you created the Home group, Windows 7 or Windows 8?
2. What version of Windows 7 do you have?
3. What is the exact issue that you have?
4. What happens when you try to connect to a Home group?
5. What error message do you get when you enter the password?
I would suggest you to go through the links to know how to create a Home group.
For Windows 8:
HomeGroup from start to finish
For Windows 7:
You can go through the link and check for the possible causes.
HomeGroup problems in Windows
HomeGroup: frequently asked questions
Do get back to us with eth answers.
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