As title states, 530s desktop randomly freezes. No specific time or program or anything. Just extremely random. May work for one to 3 days without a hiccup but eventually just becomes unresponsive. No new software installed. Cleaned fans. No hard drive or fan noise. Ran malware bytes, super antispyware, avast, and all came up clear. I ran Dell's system diagnostic check and all tests passed in the extended option. Specs: Windows Vista 64-bit E5200 dual core at 2.50GHz 4GB ram 450GB hard drive (61GB free) Any thoughts or suggestions where to start? I do not know if this is hardware or software issue. Thanks in advance!!