program hangs when trying to copy/move photo files

Can anyone offer a suggestion? When I select a photo in My Photos and try to copy or move it to another file, the program stops responding. This just started along with another problem. I can no longer just type the short version of a site into the address bar and travel there. I have to precede the site name with "http://" to get the link to work.
I have a Dell Dimension 4700 with a P4 and 1 GB of ram. The 160 GB hard drive has 49 GB free. I use Norton Internet Security 2006 and Microsoft Antispyware as well as regularly running Spybot and AdAware. I also have and use CCleaner which I update regularly.
Very frustrating and any help is appreciated. Thanks in advance.