cant find ubuntu in dual boot

and i installed ubuntu using a torrent download not via wubi & have no live disk

You need to boot to the liveCD and reinstate Grub2. Your ignorant Windows installer has blindly overwritten the Ubuntu bootloader with it's own

http://www.omgubuntu.co.uk/2011/09/live-usb-sticking-grub-2-video/

ok, but how can i create that image and type these commands if i cant log to ubuntu in the first place ?

1. download the ubuntu .iso file
2. burn the image to a disk
3. boot off the disk
4. re-install grub

you don't need to log into ubuntu to do this.

@marcus aurelius, am sry about that question, but do u mean burning image like nero or something ?

and it doesn't matter whether it's a CD or usb drive, right ??

Same difference, so no

and i use nero or orther stuff like that in burning right ??

and sry for my stupidity :)

Its cool, you're just new to the OS, you can burn the ISO with nero if you want, any will do. Just burn as SLOWLY as possible and be sure you MD5 test the ISO before you use it so that you know it is complete and consistent.

what's MD5 ?? :D :D :D

https://help.ubuntu.com/community/HowToMD5SUM

Instead of asing, you can use the web yourself and find guides like that