Windows 7: Am I infected?

Hello to all,
Thank you for any response. Yesterday while running Malwarebytes Antimalware a scan on Windows 7 Ultimate 64 bit it seemed to freeze up, now to be honest on certain cab or manifest files it can take a long time. But the clock was over 5 minutes slow, cursor immovable, and Task Manager wouldn't respond. At this point I panicked and hit my hardware reboot button, oh I was in the Administrative rights account at the time.\
I logged back in as the login with Administrative Rights account. Many items were changed. While bringing up the desktop it showed the Computer Icon for a while and I do not have it on my desktop. My icons on the running programs or displays on right side of taskbar was completely messed up. Most of the show and notification programs reverted to show notification again.
I ran MSE full scan, McAfee Full Scan, Sophos Antivirus, SuperAntispyware and such an none indicated any infection.
My user accounts had minor changes, like messed up tray icons.
Is that a glitch or is it a sign that I have some infection of malicious software. Any assistance or opinions appreciated.
glennc

you could try running scannow command promt it will check for errors
start button, type cmd. Right click on it and choose Run as Admin. Then type sfc /scannow

Many anti-malware programs,aren't what they supose to be.

Glen I am going to give you the best advice available. In the security forum we have some of the best experts available. I think that you would be better off posting there, where they will probably let you scan, post a log and give a defintitve answer.

Thank you Gentlemen for your time and assistance. I think I will take richc46's advice and post in it the Security section. Thanks again
glennc