Error 1324 + PDF's are defaulting to Photoshop CS2

Question

I recently installed a trial version of Photoshop CS2 which was on a disc lent to me. I am now regretting this action because when I go to open a PDF file it defaults to Photoshop instead of Acrobat Reader.
When attempting to un-install this trial version of CS2 I get an error message  "Error 1324. The path 'My Pictures' cantains an invalid character"
Sure would like some help out of this situation.

Answer 1

Dear John,
Many thanks for your reply to my problem which is occurring when attempting
to open PDF files emailed to me. The email program is MS Outlook 2003 (on
Windows XP) and this is my work computer.
Perhaps the Photoshop CS2 disc may have been corrupted as I have no idea of
its history however I have managed to un-install it and can do without it.
But now I am having difficulty opening PDF files even though I have Acrobat
Reader v8. I am unable to update this to the current v9.0.1 because when I
do, I get this same error message
"Error 1324 The path My Pictures or the volume is invalid. Please enter it
and try again"
Do I continue to try the fix you suggested or something different. If yes,
can you please explain where I might find 'Folder Options' and 'File Types'
in a drop down menu in Windows Explorer as I cannot find them in mine?
Best regards
Simon