Super slow user account profile boot -

I have a laptop - it's an HP pavillion with 8 Gigs onboard running Win 7 Home Prem' 64 Bit

It used to boot up just fine in all 3 user account profiles. That's changed.
Here is what I observe:
* The boot sequence appears to be normal until a profile is selected and the password is entered.
* Once the password is entered the thing seems to go into zombie mode.
* It will not respond to mouse or keyboard input for minutes (several) at a time.
* The little spinning circle appears and disappears variously.
* None of the icons along the taskbar will respond to mouse input except that when I mouse over them the spinning "busy" circle appears for a long period and that's it. There's no other response.
* Once the boot (in that profile) finishes, the computer exhibits no problems.
* Switching users to a profile that has not already booted fully starts the problem all over again



What I've tried:
Ran CCleaner and the registry facility in CCleaner with No improvement detected
I ran it as Administrator and created a new user account. The new account boots flawlessly

This is what I think I might try:
First turn to the installed software packages to see if one in particular is screwing up - there are not many - and apply them to the new user account one at a time trying to see if one in particular is the culprit. I can't tun Task manager to determine is one is a CPU hog because until the boot is complete the keyboard won't work.

Any ideas?

You could also add Process Explorer to the Startup folder.
That way it will run automatically at startup, even if you can't use the keyboard/mouse.