Sony Ericsson Xperia X10 Mini/pro :: Can't Update Apps After Deleting Gmail

I created a gmail account when I got this phone purely because it asked me to (usually I use hotmail), then started a new job, where my boss said she uses gmail to communicate. Everytime I checked my gmail on the phone it woudn't tell me MY email address, (because, I shoulda known it) but I couldn't remember what it was, so I made a new gmail account, and started using it at work. I didn't want to have two accounts so when I found out what the original account was (in the phone). I went online on my computer and deleted the account, intending to replace it with the newer one. However since deleting the old email account, I can no longer update any apps, or buy any new apps. It continously asks for the old gmail's password, but won't accept it when I've entered it.