Well from your computer configuration its hard to do much about it..
All depends on the series, FFDSHOW eat all of my processor if I don't watch out.. and I'm running a P4 HT 3.2Ghr/z
Even if you close all other aplications to watch anime, the windows might not have enough Vram to ran ffdshow..
Anyway, lets optimize your windows a bit.
Go to "Start", "Settings", "Control Panel", "System", "Advanced" tab, in the "Performance" section select "Settings". Leave only the following checked:
√ Show shadows under menus
√ Show shadows under mouse pointer
√ Show translucent selection rectangle
√ Smooth edges of screen fonts
√ Use drop shadows for icons labels on the desktop
√ Use visual styles on windows and buttons
Then select "Apply" and "OK".
Go to "Start", "Settings", "Control Panel", "System", "Advanced" tab, in the "Performance" section select "Settings". "Advanced" tab, click on "Change":
Select Custom size, and set as:
Click on "SET"
Ok everything, and it might ask for a reboot.
Disable Indexing Service
To disable the Indexing Service go into "My Computer", right-click on all your hard drive partitions one at a time, left-click "Properties". Uncheck "Allow Indexing Service to index this disk for fast file searching". Select "Apply changes to subfolders and files". If any files cannot be updated select "Ignore All".
Disable some services
Services are programs that run on the background and do not show in the taskmanager
Go to Start, Run, type "services.msc" and press enter. Left-click on the status bar twice to filter all the started service to the top. Double left-click on the Service Name you wish to change. Change the "Startup Type" to Disabled then select "Apply" and "OK", repeat for all of the following:
Distributed Link Tracking Client
Help and Support
Messenger - (Shoot the Messenger and installing SP2 will disable this)
Portable Media Serial Number - (Leave enabled for use with security dongles)
Remote Registry Service
SSDP Discovery Service
Wireless Zero Configuration - (If you are on a wireless network leave this enabled)
Now last but not least Defrag
Go to "Start", "Run", type "Dfrg.msc". Select the volume that you want to defragment, then select "Defragment".
Thats all.. ALL you can do to try to run your computer at optimal performace, if even after all this you still have slowdowns and lag, sorry mate. Only a new computer will help
"Chile is a thin and tall country"