have you tried the manual way? on my n900 when i'ved cases like yours
i'm doing steps as follows:
1. locate the installer file
2. extract the files. deb or. rpm using 7zip
3. will appear file with extension. tar
4. extract file. tar using 7zip again and you will get some folders.

you just search for related files in that folder in your mobile phone. and manually delete them.