laggy on good comp, but doesnt lag at all on rubbish laptop

I'm not sure whats wrong with my comp, it keep lagging for some reason when i try to watch a movie or some video. But it doesnt lag at all on my rubbish laptop. It started about a week or 2 ago, is there a way to fix that.

Main Comp
http://i44.tinypic.com/acvd74.png
http://i44.tinypic.com/1zlrbso.png

rubbish laptop
http://i39.tinypic.com/24zzr79.png
http://i40.tinypic.com/vzcxzq.png

I usually have a few programs open like always and it doesnt lag at all, and i play 2 games at once and watch some vid.

But now its just ms and the vid and the vid is laggy ( it finished loading the whole thing but when I watch it, it lag like walking in ch 1 fm on rubbish comp)

I even try different vid ( just incase only that one lag) but all of them are like that..so I guess there's something wrong with my comp.

How often do you clean your pc? Disk clean-up and defragments? if you dont do them often you should get into the habit of doing so that could be a cause of it. I know a site with 2 very good programs used for doing disk clean-ups and disk defragments. I will link them here.

http://www.piriform.com/ccleaner thats the downoad link for the disk cleaner.
http://www.piriform.com/defraggler is the program to defrag your pc.

You should always do a disk clean-up with Ccleaner atleast once a day and use Defraggler to defrag you're pc atleast twice a month

Give these new drivers ago: http://sites.amd.com/us/game/downloads/P...-64.aspx#1

How often do you clean your pc? Disk clean-up and defragments? if you dont do them often you should get into the habit of doing so that could be a cause of it. I know a site with 2 very good programs used for doing disk clean-ups and disk defragments. I will link them here.

http://www.piriform.com/ccleaner thats the downoad link for the disk cleaner.
http://www.piriform.com/defraggler is the program to defrag your pc.

You should always do a disk clean-up with Ccleaner atleast once a day and use Defraggler to defrag you're pc atleast twice a month

I use ccleaner everyday but I'll try Defraggler too

Give these new drivers ago: http://sites.amd.com/us/game/downloads/P...-64.aspx#1

I'm not sure which to dl, I dont understand anything on the page ;s

I'm not sure which to dl, I dont understand anything on the page ;s

The first one.