Using Windows XP pc is running slow with memory issues. CPU has recently been showing as working at 100% from time to time, have had Low Virtual Memory message and had problems running and saving Word documents, for example. Yesterday it recognised a memory stick as a drive but would not copy any files onto it or re-save them saying the disk was full. Is it a case of deleting old files and redundant programs or will that not help the processing issue. When I look at My Computer there appears to be at least 2/3 of the memory free. Any ideas please.