Dear Mr Santonu, sorry I've been away so long but other things intervened, I'm afraid.
I tried copying some pictures to CD using the Windows wizard but first they wouldn't appear for about 2 or 3 minutes, then when they did and were selected seemed to copy all right (only about 8MB, not 100MB as you suggested), but then the CD looked suspiciously unrecorded, then, though the file name appeared on platback, clicking it produced a blank screen and finally an unresponding message. This now happens all the time, so I have to return to the desktop to do anything else.
Oddly enough, text files copy and safe okay, and Corel Photo Album 6 shows all the pictures I've got (1000's of them), but when I revert back to opening them from the main folder in the hard drive, everything stops responding again, though there's plenty of free space on the hard drive.
The C: drive is partitioned, has only about 2.85GB free (15.9GB used) but the other part has 67.2GB free and 28.4GB used (which is where all the pictures are stored).
I've used Spybot-S&R to clean up malware, run SystemMechanic 8 at startup, and have Uniblue RegistryBooster installed, so could there be a conflict somewhere causing this very slow process, followed by non-responses?
Also, I can't find System Restore which seems to have disappeared, so I can't go back a month or so when everything was fine.
For information the computer has an AMD Semplon 3000+ processor with 1GB RAM and NVIDIA GeForce FX 5500, also a Maxtor hard drive and VIA SATA RAID Controller.