HEllo . Troubles with Ubuntu

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http://askubuntu.com – Friends! Yesterday I tried to install Ubuntu. I write 10.4 Ubuntu Desktop on CD, and it waz lags when I tried to boot it from CD. So, I tried to install it from USB-flash. I'm install Universal USB Installer and set it to my E:/ hard disk. Now, I cant load any system. Windows cant load Idoknowwhy and Ubuntu is can't to be installed. Coz when i'm tried to install it to hard drive, there are one message : "No root file system is defined. Please correct this from the partitioning menu.";. What I must to do to load Windows? (PS there are a lot of data on the hard) (HowTos)