No your windows 7 will not deleted
Then you're SCREWED!
yes
You have to delete the partition in which it is installed and create a new one to install the new vista.
Same as Windows XP, however you can't completely delete it, as files are in use.
The file systems supported by Windows XP and Windows Vista are essentially the same. However, Windows Vista does not support booting from FAT32 partitions, and Windows XP does not support Windows Vista's Shadow Copy feature (which makes automatic backups of files) and will delete the backups if it accesses an NTFS Windows Vista partition.
there is easy and hard way the easy way is Delete Cookies or Delete virus the hard way is get Windows XP or Windows Vista
Go to your browser whose history is to be deleted. Then go to settings and delete the history from there.
You have to create at least one more partition for Vista. If you install Vista on the partition where XP is installed Vista will delete XP. To avoid such problem you have to have one more partition. When you do that just start the Vista installation process from XP and choose just created partition for Vista.
There is a Option in the Menu > Internet Options screen that will delete all History at once also on XP and Vista you can go to Start > Programs > Accessories > System Tools > Disk Cleanup There you can delete all Unnecessary files at once too.
We want to know about mathletics delete tasks not "Vista??"
Just right click on the icon and select delete.