Hi Maxwells,
Thank you for posting your query in Microsoft Community Forums.
From the issue description, I understand that you do not have volume bar in the Windows 7 computer. I will certainly help you on this issue.
I appreciate if you could help me with more information.
-Are you referring to the volume bar in the right bottom corner of the screen?
This issue may occur if the volume icon is disabled in notifications area or the files are corrupted. Initially you can restart the computer couple of time and check if the issues resolves.
You may use the below steps and check if these help-
Method 1:
a. You may right click in the task bar near the time display and you will get a popup menu.
b. Click on properties.
c. Under behavior of system icons select ON for volume icon to always show.
d. Click OK.
You may also refer to the below link for assistance -
http://windows.microsoft.com/en-US/windows7/Change-how-icons-appear-in-the-notification-area
Method 2:
If the above step assists you get the volume icon back then I would suggest you to restart the computer and check again. If the issue reoccurs you may refer to the below provided link and use the fix it or the steps provided to resolve the issue then check -
“System icons do not appear in the notification area in Windows Vista or in Windows 7 until you restart the computer” -
http://support.microsoft.com/kb/945011/en-us
Get back to us for any issues related to Windows. We will be happy to help you. We, at Microsoft try to provide our customers with the best experience.