During loging user is not assigned to processes

The topic might sound weird but i will describe what is the point.

When you log in on your user name in windows automatically all processes have user name assigned to one another. I. e. Some processes have assigned user "System" or "Local Service" and eventually Your user name.

In my case after restart/reboot all the processes have blank user name and there is only one process that has assigned usename "system". After few or more re logins I finally can see that all processes have user name assigned as it supposed to be.

This doesn't disturb working on computer in almost any way. One thing is that system sees me as a completely new user and all the settings in most applications are not set - i have to set them all over.

I have this kind of problem since fresh installation.

I'm running Windows XP SP2 with all available updates.

Core 2 Duo E4400

2GB Patriot 800 mhz LLK

Gigabyte Gigabyte GA-965P-DS3

If anyone had or has similar problem I'd appreciate any support.