PAR
As one who have had the same problem (it happend to me with 730 MB free) it
seems you have a defected hard drive.
there is a way to check if that's the problem:
1. Format your par.
2. Copy one tga file to your par as an ani file.
3. Duplicate the file.
4. Join the files.
5. Optimize.
6. Play the animation.
7. Go back to #3 (until your hard drive is full).
If at any point the par crashes then you have a defected HD, if that's the case
replace the HD. For the best service call Micropolis customer service and for
$50 they will send you a new one (next day delivery).
hope this will help.
RA. (SLP)