That is, leave it blank and click ok.

There is a long discussion in this forum about the dangers of having just one Admin capable account, and even moreso where people try to (and succeed!) to get XP down to just one account.

Even if you can't logon, there are ways to get at the data files if you don't use EFS (please don't use that!)

Again, try no password and then try your old username and password to logon.

Bob