Windows 7 sp1 on hp 6550 probook, i5 450M processor with 8gb ram.
Been using this machine for 2 years no problem, suddenly its all freezing up. Any app I start sits and goes to "not responding" and eventually returns, even windows explorer takes minutes to open a folder. Browsers take forever to load a page. Its exactly like a memory leak or a process sucking all the memory, but in task manager cpu usage is v low about 10%, memory usage v low about 40% of 8gb, and no one process is taking lots of memory,
Ive rebooted several times no change
Ive installed all latest updates no change
Ive run scannow and no issues were found
Ive run a chkdsk on response was volume is clean ( almost instantly?)
Cpu temp is fine at around 55 C
Ive run malwarebytes and found no malware
Ive run a full virus scan with Avira and no viruses
Ive done a system restore to as far back as I could go (only to this morning) but no help.