hi,
My other PC suddenly started working extremely slowly, so I used CTRL+ALT+DEL and looked at what was going on there. All processes seemed ok, except the SYSTEM one which was 100% and wouldn't lower.
look at the processes list and click on the cpu column - click again to move the process using all the resources to the top and then tell us what you see.
I have read this many,many times and find it hard to believe.
Please post a snapshot.At 100 % you'd be shutdown long before that.
No one did so be the first,I have to see this.
After that we'll work on memory management.