Error+1721

Uninstall doesn’t

If your uninstall will not work and you get a message similar to :‐

“Error 1721 There is a problem with this Windows Installer package etc. Contact your support personnel etc.”

You will have to re‐register the windows Installer service and here is how :‐

Re boot

Have your finger poised.

After Bios has finished press F8 key

Now select “Safe Mode”

Now go to :‐

Start > Run Type in the box without the quotes “ cmd.exe”

When the black Command window opens you must type the three lines below pressing Enter at the end of each and every line.

Msiexec /unregister ( Enter ) [ note the space after msiexec ]

Msiexec /regserver ( Enter )

Exit ( Enter)

Now if you got to :‐

Start > Control Panel > Add/Remove programs

You should be able to uninstall

If the System is really corrupt you have a much lengthier process as follows :‐

First root‐out your CD because you are going to need it for you will be running System

File Checker to scan your protected operating system files.

Implement as above up to what you type on the command screen, instead of msiexec you now type

Sfc /purgecache (Enter) [ Once again note the space after sfc]

You will possibly be asked for the disc

When completed you should get the message

“ Windows File Protection successfully made the request to change”

Now go back to the command screen and type

Sfc /scanow ( Enter )

You will need the CD again

When it has finished go back to :‐

Start > Control Panel > Add/Remove Programs and get rid of the offending Prog.

Thank goodness the fiddly bit is over Yes?