(2) Why are you using two browsers (Firefox & Explorer)?
Not my thread I know, but the reason I run Firefox and Internet Explorer is simply that Microsoft makes it difficult to use its site with Firefox...
As to the question, a quick google shows the Advent 5421 comes with just 1gb of ram, not really enough to run Vista + programs in my opinion. Check how much ram you've got & if necessary order more - 2gb is £33.99 from crucial.com
I would also download & run (regularly) ccleaner from
here .
Run the cleaner, then in the tools section, clean out all the unwanted items from your startup menu.
I also much prefer using it to remove programs than the standard Windows add/remove programs - it's much quicker.
You can also use it to clean up your registry, but if you do MAKE A BACKUP first in case it messes something up (it never has for me though!)
When you've finished cleaning up you could then defrag if you wanted to.
Good luck.