ERRORS when login / delete / add MS SQL 2005 Database

[bq252250]

Hi
I need help

I can not login (sql server 2005 management studio, error:4064:
'Can not open default user database. login failed'

I cant delete my database in the control panel error: 73100090 : Error occurred while creating SQLServer client object:
'Date-Time : 23/4/2007 20:8:10. GMT+1 HC Error Number : 73100090 OS Error Number : 0 OS Error Descripting : Microsoft SQL-DMO Error -2147199728[SQL-DMO]The name 'giftaidsystem_com_bq252250' was not found in the Users collection. If the name is a qualified name, use [] to separate various parts of the name, and try again.IDispatch error #21264'

I can not create a new DB error: 73100020 : Unable to create login:
'Date-Time : 23/4/2007 20:6:59. GMT+1 HC Error Number : 73100020 OS Error Number : 0 OS Error Descripting : Microsoft SQL-DMO Error -2147200496[SQL-DMO]Login 'giftaidsystem_com_bq252250' already exists.IDispatch error #20496'

Anyone have any ideas, I have set up tickets but with no reply and the support staff can only advise creating more tickets.

any help would be great. I have my DB in my root/www directory as a backup DB. All i want is that hosted and access to it.

Many thanks
Dan