slow computer? periodic/intermittent lockups or hangs?
- bad disk blocks in a critical area like the filesystem or swap or somewhere like where programs are loading. this will cause 10 (?at least that what it was with old MFM and RLL controllers in the BIOS those had) retries until it gives up and tgives a failure and windows marks it as a bad block if I am not mistaken, and disks are slow, so this will take a long time if there a quite a few bad blocks or the same block gets read/written many times. worst case would be if it was in the $MFT (core of the filesystem). the data may be recoverable with grc's spinrite to bring back marginal sectors - spinrite may not work. after this fix is to copy the disk using fssdev.com's casper (warning: differing sector sizes won't work too well with XP and lower and possibly vista also, may only work for 7 and above)
- cpu cooler needs cleaning
- virus/spyware/trojan/worm: get norton 360 and boot the disc to clean, try also to use "norton rescue tools" (search on symantec.com or norton.com, requires product key)
- network disconnected and access has been attempted by something such as antivirus update - or virus, or one of your applications, or noficication area icons (will cause freeze for - was it 20 seconds or 2 minutes or 20 minutes?). I think it was 2 minutes to timeout where tcp/ip gives up and throws an error to the app and the app gives up - or retries... connect [to] your network. then right click on the connection and then right-click your connection and pick repair/troubleshoot/diagnose.
- you don't have enough RAM. as a rule, my rule of thumb is to max out the machine with RAM and turn off Virtual Memory. this typically speeds up the machine by 2x. only issue with turning off VM is if you use more memory than you have RAM, then you need to turn it back on. look up your motherboard or system's model at Memory Suppliers/Premier Memory or crucial. if it's an HP or Dell, you can buy upgrade memory from hp or dell respectively, or you can again buy it from crucuial or premier memory. for example: a system with 256MiB of ram on an xp system will thrash. don't go for minimum system requirements (bad idea)! it leads to disk thrashing where the system swaps fast memory (6,400MB/s-7,464MB/s) to the VERY slow disk (13MB/s). also, use a larger fixed virtual memory file, say, around 16-32GiB if you can spare it. it will make swapping faster if you are using VM and/or strapped for cash and can't buy more RAM.
- overheating damage you can try to clean computer cpu and video card cooler out, this may help, but if it's still slow, you are stuck.
out of memory errors
if you have a machine capable of more RAM than 192GiB, and you have out of memory errors, and you have maxed out your virtual memory and RAM, you should be running Windows Server 2012 Standard or DataCenter it has the capability of making use of up to 4TiB of RAM.