Ok lets see if I can write this so it makes sense to whoever reads this!! I booted up my XP Pro SP2 PC and decided to clean out a few old programs. I have 4 user accounts set up but only one as Administrator so thats what I logged into.
Now I should point out that I have two hard drives. One is partioned as C and D and the other is G. For the last few days I've been getting warnings that my C drive has very little space(Bet the experts are going uh oh) but I haven't worried about it as there's heaps on G which is where I normally put my 'stuff'.
Anyway after cleaning out what I wanted I logged out and went to my 'normal' user account. When I put my password in and pushed enter nothing happened. So I tired again and this time got a warning. Since I was suffering from a cold I didn't really click onto what it was telling me so I just clicked through until it got to the desktop. BUT it wasn't my desktop, it has created a guest account!
I also manged to get the error messages again and apprently its because I have very low drive space on C. (I was also installing Windows updates so presume they default to this drive!)
If I go to my Admin account I can go into Explorer and look at the files in my normal account in D and G but access is denied if I click on the username folder in the C drive.
I've tried a few things including trying to take ownership of the folders but access is still denied. I can't even copy from them to another account. I'm wondering if there is a registery problem and perhaps I can repair it using the XP disc?
At present theres only about 320MB left on C. What do you think?

Recommend login as administrator.
Going to Start>Programs>Accessories>System Tools>Disk Cleanup
Select C: drive and click OK
Insure all the boxes have a check mark, click OK
This should open some disk space on your C: drive.

Thanks and yes I did that but still no joy. Finally managed to take ownership of the files in the account and transfer them to a new account. Scary stuff!

Hey,

If you go into SafeMode and log into your Administrator account (not yours, the system default one) you can edit all permission settings for files from there as nothing can be denied from the system default admin. (For future reference)

Has that resolved this computer problems? Do you need any further assistance with this problem?