session expires before log-in

[mr.prozac]

hi,

i had a problem with installation of RC, once that was solved another error popped up.
When i try to log-in i get an error saying that my session is invalid or expired.

the errorlog states:
"
[06-Sep-2007 12:14:58] PHP Warning: array_merge() [function.array-merge]: Argument #2 is not an array in D:\XAMPP\htdocs\mail\program\include\main.inc on line 535
"

Could someone help me out?