I had an admin account and after i updated my PC, I can not run or install any program!

1. Do you get any error message when you install a program?
2. Have you made any recent hardware or software changes to the compute prior to the issue?

Problems working with files and folders in Windows can be caused by permissions issues, corrupted user accounts or even corrupted files. These issues often occur after upgrading to another version of Windows, connecting to other computers over a network or even just connecting an external hard drive into your computer.

Method 1:
The following article and follow the instructions given.

"Access Denied" or other errors when accessing or working with files and folders in Windows

http://support.microsoft.com/kb/2623670#method21

Method 2:
If the issue persists, I suggest you to enable the built in user account on the computer and check. You can refer to the response by Sandeep Dsouza from the following link and check if it helps.

http://answers.microsoft.com/en-us/windows/forum/windows_8-security/after-windows-8-upgrade-user-account-no-longer-has/5a610274-f356-43e9-9cb6-46dfedfde12a