Computer slower than normal

I have not had an issue with pages turning really slow on this system. XP, 160 gig hd, all I know is an AMD processor (Athlon). Do not have other windows open. Nothing has changed, hardware, software, usage. Where do I begin?

Until today, that is

 

Have run Spybot and Adaware...cleaned them out

 

There are several basic maintenance actions that you could start with before having to delve deeper -- these might speed things up. Here's my checklist:

-- Delete all temp files (c:\windows\temp\*.tmp, or on XP C:\Documents and Settings\username\Local Settings\Temp)

-- Delete temporary internet files (c:\windows\temporary internet files\*.*, or on XP C:\Documents and Settings\username\Local Settings\Temporary Internet Files)

-- If you use I.E., click on Tools, Internet Options, Delete Files, select "delete all off-line content", click OK

-- Click on Start, Programs, Accessories, Systems Tools, Disk Cleanup

-- Download AdAware, check for updates, run it and remove whatever it finds

-- Download Diskeeper and defrag

-- Download, update and turn on SpywareBlaster and SpywareGuard (or your spyware removal tool of choice).