Windows XP takes a lot of disk space when updating. So that's growing and growing. All you can do: delete old (blue) $NT... folders.
Then periodically delete old System Restore points, either with the disc cleanup wizard (all but the last one) or by turning off system restore (all). That's space also.
Running ccleaner to clean most temp files is even better than doing it with the disc cleanup wizard.
What remains can be analyzed with a tool like TREESIZE or CLDUW. It's interesting, but time-consuming.
Consider buying a larger or a second hard disk.
I run Windows XP Pro. SP2. System Information are as follows:-
OS Name Microsoft Windows XP Professional
Version 5.1.2600 Service Pack 3 Build 2600
OS Manufacturer Microsoft Corporation
System Name HOME
System Manufacturer ECS
System Model M825VXX
System Type X86-based PC
Processor x86 Family 6 Model 8 Stepping 1 AuthenticAMD ~1200 Mhz
BIOS Version/Date American Megatrends Inc. 07.00T, 4/2/2001
SMBIOS Version 2.3
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "5.1.2600.5512 (xpsp.080413-2111)"
User Name HOME\Smarty
Time Zone SA Western Standard Time
Total Physical Memory 1,024.00 MB
Available Physical Memory 599.45 MB
Total Virtual Memory 2.00 GB
Available Virtual Memory 1.96 GB
Page File Space 1.42 GB
Page File C:\pagefile.sys
Yesterday I uninstalled a program and moved 70 photos and/or graphics to my flash drive. After doing disc cleanup, error checking, defrag and running Ccleaner I found that free space which read 6.57 GB had decreased to 5.89 GB. This seeming being much of a reverse of what it should read. I repeated error checking and ran scans with Malwarebites and SuperAntispyware as well as Avast 4 Home but the result remains the same.
Thanking in advance for any comments, suggestions and/or assistance with a view to a solution of the problem.