Network problem again!

Everything has been fine until last night when I wanted to log into my laptop.

It is now prompting me for my username and password to connect which I enter correctly and it says wrong username & password!!!

I have since then went in and changed my account details on the laptop, changed username and password although it has made no difference.

However, when on laptop, I can log into both my server and home PC! When I check the workgroup, all systems are viewed but when I try to map network the drive, it does not allow the laptop files to drop down!

I have tried repairing the connection and checked the firewall settings.

Also done a ipconfig /flushdns but no luck!

Any thoughts?