errors when browsing uploaded images

i am running wp2 on my local machine with xampp under windows xp. i have successfully ‘uploaded’ 3 images using the file upload feature on the “write post” screen, but when i try to browse the images i get 21 PHP errors. here’s the first two:

Warning: strtotime() [function.strtotime]: Called with an empty time parameter. in C:\Program Files\xampp\htdocs\mysite\wp-includes\template-functions-links.php on line 53

Warning: date() [function.date]: Windows does not support dates prior to midnight (00:00:00), January 1, 1970 in C:\Program Files\xampp\htdocs\mysite\wp-includes\template-functions-links.php on line 67

the next 19 are the same but with different line numbers.

any ideas what’s causing this/how to resolve it?

thanks
simon