You may not have seen the reply to your other tread here;
You will wish to continue this discussion there, so I will lock this duplicate.
I have a Dell E521 running Windows XP Media Center and for several weeks now I have not been able to install any programs/updates? Not so sure about the updates. I keep getting an error message that the installer cannot be accessed. I have tried setting a restore point to before this all happened but without success. This is due to using PC Pro Cleaner which sets its own restore point each time its used. I updated the installer to 4.5 this morning and tried installing MS Fixit Center again but without success. I tried adding an external hard drive to the computer but it did not install correctly as I cannot access the drive area on the dashboard of the hard drive. I'm not very tech savvy so I am concerned about following suggestions not knowing if I'm doing it correctly. Can you provide the best solution to this problem and how I can resolve this issue quickly. I was also thinking of reinstalling windows but not sure if this should be done and how.