|Odd, normally sp's don't need the lower version.|
Anyway, we'd need to know more about how you used to connect. Do you have a router? Did you use logon or other authentication method?
Also can you use a wired connection just to get the updates.
Are you sure you are on your router?
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10