Windows 7 - Can't Create a homegroup

Guys I know this has been asked lots of times already but all the post I have read and things I have tried don't seem to be working so why cant I create a home group.
I have a laptop that came with windows 7 pre installed, my desktop pc was running vista. I upgraded this to windows 7 yesterday. Prior to the upgrade I had the two machines networked and that was ok. Now niether machine can see the other but my router can see them both?????????? When I try on either machine to create the home group I get a message that says "unable to create a home group on this machine"
Is the work group I created previously to upgrading to windows 7 interferring with this and if it is, how can I delete this group? This work group is also something I can no longer see.
Please help it's doing my nut in.

What version of Windows 7 are you trying to create the Homegroup from, basic, premium,ultimate?

Home Premium on both machines

Can you check and make sure all these services are set to auto in services.

Click Start and type Services.msc in the dialog box to open the services snap-in.
Then check if the following services are started:
-
DNS Client service started and on automatic
SSDP Discovery service started and on automatic
UPnP Device Host service started and on automatic
Function Discovery Resource Publication service started and on automatic

Why can’t I access my HomeGroup?

There are several reasons why you can’t access your HomeGroup. Here are the most popular reasons for not being able to connect to your HomeGroup.

• Your computer might not be connected to the network the HomeGroup is on. Make sure the computer has network/Internet access. Try having Windows 7 troubleshoot the Internet connection for you.
• Your network location might not be set to Home. Learn how to check and change your network location if needed.
• Network Discovery might be turned off. Learn how to turn Network Discovery back on.
• Other computers in the HomeGroup might be turned off.
• Other computer in the HomeGroup might not be sharing files. Learn how to share files using HomeGroup.
• Maybe someone changed the HomeGroup password. Try checking the HomeGroup password on other computers in the HomeGroup. If the HomeGroup password was changed, change the HomeGroup password on your computer.
• Your computer might not yet be joined to a HomeGroup. Learn how to join or create a HomeGroup.
• Turn off any third party firewalls (usually bundled with antivirus software) that are installed on your computer.
• If none of these troubleshooting tips work, try restarting your computer, or leave and then re-join the HomeGroup.

Make sure that all machines are using the same name for the workgroup, needs to be the same workgroup name for all machines you want to share with.
Make sure that all your machines are using different machine names.

Have you run the troubleshooter?
That should eliminate network issues.

Hello Tristan, and welcome to Seven Forums.

In addition, you might see if this tutorial below may be able to help you get a Homegroup created.

Homegroup - Create

Hope this helps,
Shawn

ok I've tried all those butr still get the same message. The message appear after the "select what you want to share screen"

Tristan,

Do you currently have a Home network setup in step 1 in the tutorial instead of a Work network on both computers?

Homegroup - Create

Take a look here for help Tristan. Why can't I create a homegroup?
Also go through the check list below.

If IPv6 isn't working correctly you also won't be able to create a Homegroup. This check list should insure that IPv6 is working correctly on your machine.

Are you running an Anti virus program? If so which one?
1. Temporarily disable Firewall and third party antivirus program on the computer for a test.

To enable certain IPv6 components in Windows 7, follow these steps:
1. Click StartCollapse this imageExpand this ima, type regedit in the Start Search box, and then click regedit.exe in the Programs list.
2. In the User Account Control dialog box, click Continue.
3. In Registry Editor, locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\
4. Double-click DisabledComponents to modify the DisabledComponents entry.

Note If the DisabledComponents entry is unavailable, you must create it. To do this, follow these steps:
a. In the Edit menu, point to New, and then click DWORD (32-bit) Value.
b. Type DisabledComponents, and then press ENTER.
c. Double-click DisabledComponents.
5. Type any one of the following values to configure the IPv6 protocol, and then click OK:
Type 0 to enable all IPv6 components.

Note The value "0" is the default setting.

I've been spreading that particular tip around the web, myself. Posting where it can be used.
Windows 7, for some unaccountable reason, sees all of IPv6 as not working unless the supposedly optional key to say which bits arent't working is present and set to zero