lsass.exe process very high ram usage

Hello everyone, I've been having a very weird problem recently, in which I BELIEVE is involving high physical memory usage. Sometimes I will be doing things such as playing a game, or watching a stream, and my computer will run fine for a little while. But at random times, my computer will majorly...

Lately, I've been getting alerts about high cpu usage. Checking Process Explorer, I see that spoolsv.exe is using about 49-50% and Systems Idle is using 45-50. I have no idea why this is happening. Only recent change has been the swapping out of a HP Photosmart printer for a Lexmark Pro 915...

This is freaking driving me crazy. This is the SECOND Windows 7 system I've had this issue on and it completely cripples the computer. Basically, whenever I downloaded anything, be it via uTorrent, Firebox, even speed tests, my CPU usage goes to 100% and nothing responded until the download it...

After laptop is on for about 5-10 minutes I start getting insane lag doing anything. Just trying to get screenshots and typing this in is taking 30 minutes. Hopefully screenshots can explain better.:mad: