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Then clean install the windows as suggested by Greg. Once done install all the relevant drivers:
Updating Dell Drivers
Keep us posted with the results so we can advise you further.
Thanks. I do have a followup question.
When going to the Dell support site for drivers, there are quite a number of "recommended" drivers that seem to be specific for a given hardware configuration. For example, just to pick two:
1. Under video drivers, there are 6 recommended drivers, including nVidia Graphics Driver, nVIDIA Geforce GT530 (M208n) Graphics Driver , Intel Graphics Controller, v.8.15.10.2291, A01 , AMD Turks XT Radeon HD6670 (M208), v.8.812, A00 , AMD Caicos Radeon HD6450 (1G DDR3, M116 & ML116), v.8.812-110104a-112217C, A00 , and nVidia Nvidia M207(D12M2-25) GT420 (1G DDR3), v.263.11, A01 .
Surely it does't make sense that I need them all! Should I install them all or determine what my video card (or onboard chipset) is and just install the driver(s) for them?
2. There are 3 recommended wireless drivers listed: Dell Wireless 1502 WLAN Driver , Realtek RTL81XX PCI-E Network Connection, v.7.038.0113.2011, A01 , Atheros Wireless 1502 WLAN Mini Card Desktops, v.9.1.0.328, A01 . Again, install them all?
Thank you.