Did you remove it via
Using the add/remove programs option lollowed by the MCPR removal tool works
reboot then run
Reinstall from your account.
Also if this does not help we need
1 Operating system details and service pack?
PC specs and ram amount
any other Anti virus programs installed?
What you tried and what occurred when it would not load. In other words any popup , message or how far through the install process u went?
i have removed it fro uninstall option..i am using dell inspiron windows 7 home basic with 4GB RAM and 320 harddisk....i am trying to reinstall it with mcafee cd..it shows that installation unsuccessful
actually i have downloaded an another software windows defender which is also at present is in my use.
Your Windows 7 should be Service Pack One (SP1) there's help with that here: https://community.mcafee.com/docs/DOC-2205
After uninstalling McAfee using Control Panel you should run the MCPR cleanup tool as Peacekeeper has already stated. It is linked in his post or under Useful Links at the top of this page.
He also stated to reinstall from your account online NOT from your CD, which is probably a much older version.
The account page is here: https://home.mcafee.com/Secure/Protected/Login.aspx