[SOLVED]deleting linux partitions and windows MBR

can someone help me
i installed ubuntu alongside Windows XP on my netbook so it is dual boot now.
but i messed up installation leaving ubuntu unstable.
so i wanted to extend my primary C partition with Win XP, deleting one with ubuntu so i can reinstall ubuntu clean.
Problem is, gparted see only one partition of unallocated space (on pics below) and when i double click it, mesagge says:"cant have overlapping partitions"
i can boot my Win Xp without problems using GNU Grub
so to resume, i want to delete ubuntu partition but i can't since it doesn't shows up
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heres what i see in gparted:


and when i click to device-attempt data rescue i got this message:


and when i click ok i got this message:


and when i click view i got this message:


when i click on desktop File/system utils-partimage, this opens up:

sda1 is my C partition NTFS where is my WIN XP installed
sda2 extended i dont know what this is
sda5 and SDA6 that is where i installed my ubuntu, these 2 partitions together have 10 GB
sdb1 this is my flash USB stick

*edit
i fixed it,
downloaded partition wizard home edition that runs under Windows XP, he was able to see linux partition,
i erased it and then my computer crashed and on boot message appeared:"GRUB- error: no such partition grub rescue>"
i was really scared at this point, thought my windows xp was deleted or something.
turns out deleting linux partitions, i messed up windows Master Boot Record.
so i downloaded rescatux, booted it from USB, and fixed MBR using that.
My windows XP booted and everything is ok now

www.mediafire.com/?gg27127gju5i8mr