4 partitions marked as Active makes no sense.
Normally, only one is active.
If you had 4 marked as active - how do you expect to choose which one to boot from? There is no pre-boot manager.
Can you explain by what you mean by 'flash memory' - is it a Removable USB flash drive or a Fixed-disk type?
Can you explain what you mean by WIndows 7 isos - do you mean WIndows 7 INSTALL ISOs?
what do you mean by there is no pre-boot manager .
i was thinking that by switching from removable to basic i will be able to do the following like my harddisk .
1 : install windows on partiton 1
2 : install ubuntu on parition 2
the ubuntu use grub4dos to detect windows and ubuntu , and ofcourse more others but thats i know so far .
from here i thought if i can use the grub to be the boot loader for my flash .
so when i boot from bios to the flash memory the grubs load and allow me to choose which one from the flash partitions .
Question 2 .
i dont know if the grub can be used to link programs like Yumi or the link that i am going to read now .
but is the Grub is capable of linking me to those loaders .
3 . putting all windows bootable iso's like the link you gave me on partition 3
4 . using the Yumi at partiton 4 .
here i said all my thoughts