C;drive = 9.32gb - freespace = 1.29gb - (need 1.4 to defrag)C drive consists of 3 folders ; 1. docs&settings 800mb 2. programme files 480mb 3. windows 4,500mb this adds up to 6gb + 1.3 free =7.3gb on 9.3 total so there seems to be 2gb missing somehow.I have 2 questions; 1 where is the missing 2gb? &2 what can I uninstall and/or delete from the 4.5gb windows folder?Do I need all those old security updates? 1 person needs an answerI do too

Here are some things you can do to free up disk space, the first one deals with the Windows security updates:1. If your PC is behaving properly you can remove the Windows hotfix hidden backup files that begin $NTUninstallKB from the WINDOWS folder. There are two ways to do it:A. Manually, but copy the folders to a CD/DVD first to allow their restoration should a fix need to be later removed. Now delete them from the \WINDOWS folder but leave the orphaned Add or Remove Programs entries intact. Only delete the $NTUninstallKB folders that relate to fixes not those for applications like Word, WMP, etc. Also, DO NOT DELETE THE $hf_mig$ folder.B. My preference is to run a script which additionally removes the corresponding entries in Add or Remove Programs. Once they are removed by the script, they cannot be restored. Download, extract and run this little scripthttp://www.dougknox.com/xp/utils/xp_hotfix_backup.htm Create a system restore point first just in case anything goes wrong during the registry updating.2. Remove temporary files, i.e. in a Run window (Windows key+R), type %temp% and press Enter. Everything that is displayed can be deleted, however, there may a few obstinate, in use files that refuse to go.3. Reduce the space allocated to system restore, click Start > All Programs > Accessories > System Tools > System Restore > Settings (in the left pane) > System Restore Tab > Settings and in the left pane move the slider to the left to reduce the space allocated.4. Reduce the space allocated to the Recycle Bin, right-click it > Properties and change the amount of space allocated.5. If you don't use Hibernation you can save yourself the equivalent in hard drive space as RAM you have installed by turning it off, i.e. right-click Desktop > Properties > Screen Saver Tab > Power at the bottom > Hibernate Tab and remove the tick from ‘Enable Hibernation’.6. Uninstall any programs that are no longer used. Also remove unwanted Windows components (in the left pane of Add or Remove Programs).7. Although not huge, you can delete all the files in C:\WINDOWS\PCHealth\HelpCtr\DataColl that have an extension of XML. Also delete the Event Viewer files via Start > Administrative Tools > Event Viewer > highlight Application > Action > Clear All Events then click No to the “Do you want to save..... “ question. Repeat the above by highlighting and deleting the other categories: Security, System, Internet Explorer and Windows Power Shell.

Your sizes will not show all hidden files, including swap file.In edition to BurrWalnut's excellent answer; In Internet Options, delete all temp files and set the default size of the store to 50mb