try the applications menu bar on the extention in question in the addons page, if disable doesn't show up there, tab to the button next to the list box with the extentions and try that one, it may bring up a small menu for you to pick from, or, it may have a few different buttons.
Also, afrim, use control shift escape in windows 7, hit control tab till you get to process's, use the alt v keystroke, press the letter s, and select the columns you want displayed with the check box's.
Next time you hit control shift escape, you'll have all that info, and I suggest processor usage, physical ram, and virtual ram as columns, you can also end process's from there by choosing a process, using the delete key, or alt E for end process on it, and tabbing to the end process button and activating it.
As well, you can use the applications menu bar on a process to get a list of more things you can do, such as seeing where that process's file is located in windows, or checking the file's properties.
Another good resource is MSConfig which you can type into the run dialog box that you can bring up with windows r, where you can use the services and startup tabs with there checkbox's to help you as well, just press apply and okay to save your changes and restart the computer when you want.
A good site to look up what all these files are for, both in task manager and msconfig, is bleepingcomputer.com
You also have services.msc which you can type into run too, which has a great deal of configuration through the menu bar, including view and options, and for single services with the applications menu.
How ever, you need to be very careful here, I suggest backing up your registry first, and it's possible to screw stuff up bad enough to have to boot into safe mode, so also make a system restore point.
On the other hand, this is the single best way to reduce ram and processor usage aside from killing the very obvious process's... And even though windows 7 probably has the most services to wade through of all the windows versions, there are good guides that you can follow that shouldn't break anything, though you should still use common sense especially on the ones that the guides don't mention, and always try to use manual more than disable.
The best site I've found so far for this is called black viper, and should have a guide for your version of windows, just be aware that it can be easy to break network connectivity, because there are allot of process's that rely on each other, with some having to start up automatically while others don't, but even doing this with out ever touching network stuff helps a bunch.
Otherwise you've still got temp file cleaning, registry conflict and old extention cleaning, defragging, unneeded program data wiping, scheduled malware scanning and realtime protection.
I suggest CCleaner for cleaning stuff out and basic registry fixing, and Defraggler for defragging, both from piriform.com though I've heard ozlogics is good too, also I'd use revo uninstaler and use it on safe mode instead of regular uninstallers, and advanced mode if that doesn't work, as well as going into C:\documents and settings\your user name\application data, and checking all the folders in there to see if the name of that program you had comes up, if so, delete that folder and empty the recycle bin afterwards.
Anti virus is more a personal choice, but it also depends on the computer and what your willing to put up with for accessibility, or lack there of, but I can suggest combofix, spybot search and destroy, clamwin, and Macafee stinger for quick but powerful checking, Microsoft Security Essentials and AVG free for light realtime and scheduled cleaning, and avast, AVG Business, and malware bytes if they fixed their stupid interface by now for heavier everything.
All those things, when done right, should help allot, and as to accessibility? going to control panel, appearance and personalization, change the theme, and picking windows classic in the grid that comes up, then saving, should help with that.
