ADobe Photoshop or Paint Shop Pro will both convert your Mac PICT files to just about any other image type you could think of.
You could burn your files to CD and get a friend with either of these programs to convert them for you, or if you don't have access at all to a decent graphics program you could try "Irfan View" - freeware - can be downloaded by clicking
HERE !
Edited to add :
"JPeg" is a standard image compression mechanism - the resulting image has a ".jpg" extension.
JPEG compression is described as "lossy" as some of the image quality is lost during the compression process.
The term "JPEG" stands for "Joint Photographic Experts Group" - the standards committee that designed this image compression format.
Coconutty