Thanks PodMaster-it doesn't help.The application doesn't die here.
If I append "die" to the next line of code:

$Book = $Excel->Workbooks->Open($restrictfile)|| die "EEEEEEEEEEEEEK: 
+Can't create Excel.Application : Do you have M
+icrosoft Excel installed? : $! : $^E";
 ;
[download]

it dies only on computer with office 2000 and says "No such file or directory" , although if office 2003 installed -everything works fine.