For Git Bash

If you are running msysgit (I am assuming you are) and are looking to run Git Bash (I recommend it over TortoiseGit, but I lean to the CLI more than GUI now), you need to figure out what your home directory is for Git Bash by starting it then type pwd (On Windows 7, it will be something like C:\Users\phsr I think). While you're in Git Bash, you should mkdir .ssh.

After you have the home directory, and a .ssh folder under that, you want to open PuTTYgen and open the key (.ppk file) you have previously created. Once your key is open, you want to select Conversions -> Export OpenSSH key and save it to HOME\.ssh\id_rsa. After you have the key at that location, Git Bash will recognize the key and use it.

Note: Comments indicate that this doesn't work in all cases. You may need to copy the OpenSSH key to Program Files\Git\.ssh\id_rsa (or Program Files (x86)\Git\.ssh\id_rsa).

For TortoiseGit

When using TortoiseGit, you need to set the SSH key via pacey's directions. You need to do that for every repository you are using TortoiseGit with.

It seems, that your WSUS database is some way damaged. For managing WSUS there is wsusutil.exe program. Backup system state with all WSUS files before doing anything, also backup WSUS database with wsusutil.exe export. Completely remove WSUS. Install the last WSUS version, configure as you wish. Restore saved WSUS files to some location, make wsusutil movecontent. Then make wsusutil reset. This probably will prevent WSUS from downloading all updates again. If everything is OK, run Cleanup Wizard to remove unnecessary update files. If this hack doesn't work, you have a backup