To type vowels with accent marks, hold down the ALT key and type the following numbers on the numeric key pad (right side of keyboard).
 

é alt 130                 î alt 140

è alt 138                 ô alt 147

ê alt 136                 û alt 150

ù alt 151

ç alt 135

Ç alt 128
 

à alt 133

â alt 131
 

N.B. This will work for word processing programs and some other programs. Various other programs may have special ways of applying accent marks. See the help section of the program if you aren't sure.