When I tell the installer to browse the files in my downloads folder I get a huge pop up of all the files in there saying "There are some files which couldn't be read"...". Mind you it read the files a couple of days ago when I was browsing with no problems.

I need to look at the files cause there is a glich on one my lots which is causing the car that my sim leaves for work in to be delayed when leaving and the taxis not to leave at all.

If you can't get cleaninstaller to read them, try the binary search method (AKA the 50% method)
http://www.sims2wiki.info/wiki.php?..._Custom_Content

It really takes very few restarts to isolate the problem files. I would suggest going through the entire article first. You might luck out and find them immediately. If you can't isolate the download that is causing this ( it still happens with the entire downloads folder removed) it's probably a corrupt portal, and the only solution is to move the sims out to another lot.

Or, try the amazing DDO: http://www.sims2wiki.info/wiki.php?...nload_Organiser