Process svchost.exe is taking up the CPU and it looks like it will run forever (in days).
In my case I had a fresh install of Vista SP2. I was able to get rid of this by manually installing some of the updates.
First of all disable Windows Update and restart PC, so that the svchost.exe was in sleep state (no CPU usage).

After that it is required to manually install the following Windows updates:

• KB3205638: http://www.catalog.update.microsoft.com/Search.aspx?q=KB3205638 Vista
• KB4012583: http://www.catalog.update.microsoft.com/Search.aspx?q=KB4012583 Vista
• KB4015195: http://www.catalog.update.microsoft.com/Search.aspx?q=KB4015195 Vista
• KB4015380: http://www.catalog.update.microsoft.com/Search.aspx?q=KB4015380 Vista

As soon as the updates are installed and the PC is restarted, you should be able to check and install all updates as usual.

If you plan to migrate your current OS to SSD you will need a tool which will help you move the system to the new the disk. In most cases SSD will be smaller then your current disk, so the tool should be able to shrink partitions during the operation.
There is a lot of tools available, but most of them are not free. I have used EaseUS Todo Backup Free which includes this functionality. In my case the disk had 5 partitions, but the OS partition was the third one, but even that was not problem for the EaseUS Todo Backup. It automatically shrunk the third partition, great job!
After you install the software, just click Clone button on the top and start migration in a few seconds.