Today, i noticed my computer becoming very very very sluggish. It would go "Not responding" for several minutes on just about any click.

I have Windows7 (currently cannot get more of the specifics of the computer due to its sluggishness)

I downloaded the malwarebyte's Anti-Malware on a USB stick, moved it to my computer's desktop. That was a looooooooooong process as it would be "not responding" for every click. Finally got it there, ran it as instructed, and i got an error message that it failed. So, as instructed, i renamed the file, and ran it a second time. This time it went ok until i got another message saying it could not rename a file in the destination directory. Move File failed; code 183. I had the choices of Abort, Retry or Ignore. I chose Retry and it ran ok. I updated MBAM and started scanning. Now, it says it is scanning, time elapse 1 minutes 41 seconds, but that has been the display for over half an hour now (still showing 1 minute 41 seconds). Since my screensaver came up, i moved my pen to see how it was going. Now, it is still at 1 minute 41 seconds, but i have a "not responding" message on top of the window, with the turning cursor, over and over and over again.

Should i restart from scratch? I MIGHT have to restart the computer (which will take a loooooooooooong time too!)