"I CANNOT DELETE OLD E MAILS,NEW ONES YES"
If you want to be treated as shouting, and therefore receive fewer answers,
post in ALL CAPITAL LETTERS.
This problem usually means you need to download and install this fix, with
Windows Mail not running:
http://support.microsoft.com/default.aspx/kb/941090
Although it's labelled as for mail stuck in the Outbox, it also works in
other folders. If you don't know whether to use the 32-bit version or
the 64-bit version, try the 32-bit version first. Certain common
antivirus programs, such as most of those from Norton or McAfee,
tend to cause such problems, although seldom immediately, so if you
have such a program, remember where to find the fix - you are likely
to need it again. A recent antivirus program from Trend also causes
assorted problems in Windows Mail.