According to Microsoft site for this the following are the system requirements.
Personal computer with an Intel Pentium 233-megahertz (MHz) or higher processor; Pentium III recommended.
Operating system: WinXP SP2 or later
64MB RAM (minimum); 128MB RAM (recommended).
20MB of available hard disk space.
IE6.0 or later.
My impression is that the Celeron is not ideal as it states Pentium III
Could be a conflict with other programme or security software. Also the system perfomance may play a big part.