"error" messages

[jp osu]

I have been receiving "error" messages for a while now when I try to open
things or download anything from the internet. The exact message is "Windows
cannot find '(null)'. Make sure you typed the name correctly, and then try
again. To search for a file, click the Start button, and then click Search."
Someone suggested a while ago I download a specific update but it will not
allow me to download anything. I am using Windows XP but this is happening no
matter the program I am trying to open. Please help.

 

[Mary Sauer]

Empty your cache, see if that helps. In IE, tools, Internet Options, delete files.

 

[jp osu]

I did that and nothing is working. Any other suggestions? Thanks.