Open My computer see the free space available now.
1.Try C: properties tools a) disk clean up
more options b) delete Old system restore files
this will delete all except last one.
2. Download DiskSweeperFree2 from
http://www.craveworldwide.com/disksweep.zip
select the three options at bottom left also.
( zero byte/ignore hidden files/ignore system files)
3. usual ccleaner from http://www.filehippo.com
4. Now the registry ( redundant entries)
A safe program Wise registry cleaner form
http://www.wisecleaner.com
delete only green marked entries.
para two: You can safely delete/copy the folders from $NTuninstallKBxxxxxx from C:/Windows.
I have ( about 500MB )deleted them , long back.
Para three : I would like to copy/transfer the files in C:/Windows/$hf_mig$ to save disk space.which contains all the updates. already copied to system/system32/Dll cache ( protected system folder do not tamper ), and IE etc.. ( only shows 370MB can wait !). Very useful to update if you reinstall XP. Make a CD copy.
How much disk space saved around 2 GB ?
Para four: C: directory should have 50% free space for faster operation. Remove unused Program files/ ( other than Microsoft based like office etc )video/audio files etc to another Directory or CD.
Finally C:/ Properties/tools check disk and defragment.