Enabling Protection

I've been using SpywareBlaster for a very long time. Just recently I can't seem to get the "Enable all protection" to work after updating. I click on it, it runs very fast about 3/4ths of the way across the bar and then stops. Then I get a sign that the program is not responding.

I have a Dell Dimension 4600 - Windows XP SP2 - 512 RAM - IE 7
I run AVG Antivirus w/Firewall
SpywareSweeper
a2 Squared

These are the same programs I've been running with no problem. I can't understand why it has suddenly quit functioning. There is one thing. I had previously paid for the auto update feature. It recently expired and I decided to just update on my own and actually it's been since then that this problem has been occurring. I do have the latest version of SpywareBlaster but wonder if it would help to uninstall and reinstall.

Any help would be appreciated.
Thank you,
Nikilet

 

I would uninstall,reboot then reinstall the free ver.
ps. disable all protection before the uninstall.