|There are a couple of boring old standards that you could try, they sometimes help general problems:|
Run IE Repair (double click Microsoft IE & Tools entry in Control Panel/Add-Remove to get the option).
Shut down and restart in MS-DOS mode then type scanreg /fix (hit Return). This rebuilds your registry.
The above are harmless but I've more faith in this being a background program running, as stated by others. You can "temporarily" untick anything in msconfig (although it's best to keep ScanRegistry in place). Two LoadPowerProfile entries are normal. This should help:
Ctrl-Alt-Del can sometimes be informative too.
Could you list what anti-malware/virus products you are using please?
Here's a freebie Trojan finder/fixer that you may wish to try:
A2FREE - JUST DOWN PAGE
64M should be enough and this doesn't sound like a RAM problem - tho anything is possible.