XP pro in use with 2.4GB processor& 256Mb RAM with 40 gig hard drive. Boot up ran gradually slower & slower. AVG, Spybot & Adaware did find a trojan horse and several viruses and dealt with them. All rerun agin and indicate a clean system, but now it is more difficult to boot up and "c" drive indicates almost full HELP NEEDED, or is new hard drive the remedy.
go to "MY COMPUTER" right click on local C: and tell what amount of free space there is. and as a foot note, if you have any spare cash it is well worth investing in another 256k mb ram of exactly same brand, its very cheap at the moment. Recently i purchased a 180gig hdd along with 512mb ram for less than £80.
run disk cleanup by right clicking on your c: drive and choosing properties / disk cleanup, the viruses may have created a whole load of garbage that simply needs deleteing. It could also be that the viruses have made copies of your files everywhere and so a file duplicator finder eraser programme would be handy, another thing is to clean out your registry from defunct items with an appropriate cleaner.
When searching for the culprit files make sure you can see hidden folders (in explorer go to tools/folder options/view and tick display hidden files and folders ).Also clear out all your temp files click here is an ecxellent free utility to do this.