Check your time/date in BIOS (tap delete key at boot, usually)
Dumprep is a non-essential system process used for reporting errors to MS. It is harmless.
The freezes are probably unrelated to the above problems. Do you notice a pattern to the freezes, for example, a specific application or command that triggers them? When you say freeze, does that mean the system stops responding, or that you lose your input devies (keyboard/mouse) or what, exactly?
Since the system is about 4 years old, hardware could be an issue. Download and install Motherboard Monitor
and keep an eye on temps. Also, pop the side of the comp off and check for dust and crud on the fans. Your memory sticks are one 128 and one 256? Pull one at a time for diagnostics. If possible, replace both sticks with a known good stick just to see if there is a change in the system freezes.
Thanks for your reply. To respond to your suggestions...
Freezing occurs randomly (lose use of my input devices). It may be at startup, after Windows has loaded, but before all desktop items have appeared. It also occurs during web surfing and while using MS Word. There doesn't appear to be any pattern. Sometimes a couple of reboots are required.
I did resolve the date and clock speed issues in setup a couple of days ago, and they haven't returned. My concern is why they occured in the first place.
I don't have any extra memory, and am unsure how to do diagnostics on what I do have. Existing memory is: 512Mb Kingston DDR (266) and 256Mb generic DDR (266).
I don't know why I didn't think of heat as an issue...guess I always suspect viruses or malware before anything else. Downloaded MBM and the case is 39°C, CPU is 71°C (yikes!) and the sensor is 30°C. We have been experiencing a heatwave the last week or so, and my house is not air conditioned. Looks like this might well be the problem. I did dust out the case, but it wasn't bad as I do that routinely.
Thanks again for your suggestions. Is there anything I can do to bring the CPU temp down?