Can't open files

[topcat_68]

Hello, Dell engineers have 'cleaned' my desk top and i have reinstalled Windows XP Home edition - however, some files will not open.

Any ideas

 

[me 1]

What kind of files? What extension? (filename.what?)
Do you get an error?
Did U reinstall your programs?
Did U specify what programs to open what type of files in Folder Options?