Vista - XP boot up

Hi,
I've recently had a tojan on my system and now it wont boot up, it gets as
far a the adminstator or username log in, flashes a picture that I have as my
desktop with out the icons then says its logging off user, saving settings,
then I'm back to the administrator/user icons again, so I can log on again,
thus going round in circles. Does any body know how I can sort this problem
out. I dont have the XP CD as it came pre-installed. The computer is a
Packard Bell running XP home.

"ever-so-greatfull" <eversogreatfull@xxxxxx> wrote in
message news:736006D0-8596-41EB-B3D0-81F7C9C3DAC5@xxxxxxNo recovery partition or other recovery capability? Check your
documentation.
If you don't have the DOC's contact Packard Bell.

For assistance in these discussion groups, ask in an appropriate group for
Windows XP. This is a .NET programming group.

As you appear to be using a web interface, start here:

http://www.microsoft.com/communities...s/default.aspx

In the tree on the left, first open the English category, then open Windows.
In Windows, find and open the category for Windows XP.
In that category, find a group to post in.