Strange Hyperlink error

Hi I have this user who comes across this error when she tries to open a image file. She can actually open this file for a few times before encourtering the error. C/Side Hyperlinking Failed C/Side Hyperlinking requires at least windows 95 or windows NT 4.0 with a Web Browser. You tried to Hyperlink to this target … Do you want to place that hyperlink target on the clipboard? The code to open this image file is just HyperLink(“File Path”). The file path is “h:\pr attachment-IT\PR04-00009a.jpg” where h drive is a mapped network drive. Any ideas as to why there is this error? Thanks Tazzy1972