Low Free Space on PC

Hello,

I'd just like to know if somebody can help me with getting more space in my PC. My PC has only 5% of free space (664 MB) and after defragmenting the disk I'd like to know which of these files can I safely delete :

Fragments File Size Files that cannot be defragmented

2,612 12 MB \WINDOWS\system32\config\systemprofile\Local Settings\Temp\Microsoft .NET Framework 2.0-KB983583_20100821_111254109-Msi0.txt
1,519 13 MB \WINDOWS\system32\dllcache\hwxjpn.dll
482 24 MB \Documents and Settings\Local Settings\Application Data\Identities\{6DFE5E67-1944-45BE-9386-237BFCE1800E}\Microsoft\Outlook Express\Inbox.dbx
641 29 MB \Documents and Settings\Local Settings\Application Data\Identities\{6DFE5E67-1944-45BE-9386-237BFCE1800E}\Microsoft\Outlook Express\Deleted Items.dbx
441 30 MB \WINDOWS\system32\config\software
461 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1836\snapshot\_REGISTRY_MACHINE_SOFTWARE
459 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1838\snapshot\_REGISTRY_MACHINE_SOFTWARE
460 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1842\snapshot\_REGISTRY_MACHINE_SOFTWARE
459 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1832\snapshot\_REGISTRY_MACHINE_SOFTWARE
553 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1827\snapshot\_REGISTRY_MACHINE_SOFTWARE
447 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1828\snapshot\_REGISTRY_MACHINE_SOFTWARE
469 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1829\snapshot\_REGISTRY_MACHINE_SOFTWARE
468 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1839\snapshot\_REGISTRY_MACHINE_SOFTWARE
459 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1833\snapshot\_REGISTRY_MACHINE_SOFTWARE
470 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1830\snapshot\_REGISTRY_MACHINE_SOFTWARE
472 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1834\snapshot\_REGISTRY_MACHINE_SOFTWARE
472 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1831\snapshot\_REGISTRY_MACHINE_SOFTWARE
470 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1835\snapshot\_REGISTRY_MACHINE_SOFTWARE
465 29 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1837\snapshot\_REGISTRY_MACHINE_SOFTWARE
761 33 MB \Documents and Settings\Local Settings\Application Data\Mozilla\Firefox\Profiles\sc4grwwf.default\urlclassifier3.sqlite
676 34 MB \Program Files\Inkscape\libgtkmm-2.4-1.dll
640 34 MB \WINDOWS\system32\MRT.exe
700 34 MB \System Volume Information\_restore{31EB4D07-F9C5-4D25-B508-2032D07F381A}\RP1842\A0146380.exe
685 43 MB \Program Files\Java\jre6\lib\rt.jar
664 45 MB \Documents and Settings\My Documents\Inkscape-Tutorials\650ebaytemplates.zip
1,676 114 MB \WINDOWS\Installer\12fd2ce.msp
461 166 MB \WINDOWS\SoftwareDistribution\DataStore\DataStore.edb

I know I'm not going to get a great amount of free space, but I like to know what files are superfluous and also every bit of free space helps.

Thanks in advance.