Ah, that was a wrong comment by me, as I thought that MohammadAG had linked against the app manager deb instead.
Please ignore my last comment.

Ok, i just tired installing rootsh with the dpkg command in X Terminal but it said that the operation requires superuser privilege.

How do i give myslef superuser privilege?

Many thanks for all the help so far guys

That's what you call a catch-22 situation - the normal answer is to install rootsh. You can try using sudo - I'm not sure whether that's set up to allow it by default or not:

Ok, il try that

It asks for a password again. I get the feeling this is becoming circular

Yeah sorry, this is what i was referring to in my earlier post but didn't explain myself well enough.

We had a debate in a thread a while ago about whether rootsh should be included or installed by default because it was the only way to fix things if the app manager (HAM) gets broken. While that wasn't really disputed, it was opined that the scenario wasn't likely to occur for a typical user and that flashing the device is an expected possible solution for "powerusers".

Your case is the first one i've seen that actually provides evidence to the contrary. I realize that's not much comfort to you but i will have an example to use if/when this comes up again.

You're probably better off at this point backing up and getting it over with (the flashing).

Oh well, if it has to be done, it has to be done. I will remember to get rootsh when I start over.

Is there an easier way to reflash than the method Rob1n gave?

I haven't had to flash my phone yet so i don't know about easier/harder ways, but there are some good threads here about it and there's a wiki entry that explains it in detail.

Note that there's a chance someone could come along and figure out a way to fix your particular problem without reflashing, but the fact that has not happened yet indicates you should reflash if you need new apps. You could always play the waiting game if not... just saying.

For anyone who had the same problem as me, it was fixed by reinstalling the firmware by using the Nokia Software Updater.

Thank you everyone for your help